That would be Have A Nice Day: A Tale Of Blood And Sweatsocks. It’s a frigging awesome book. I know the OP said no sports autobiographies, but this book concentrates more on the performance side rather than training and such. And besides, pro wrestling isn’t a sport anyway. The sequel Foley is Good and the Real World is Faker Than Wrestling is also really good.
Wake Me when it’s Funny by Gary Marshall
It’s about his career in comedy from writing for early TV shows to making Happy Days and Mork and Mindy to making films like Young Doctors in Love and Pretty Woman.
If regular biographies qualify-
SISTER AIMEE by Daniel Mark Epstein, the author is not a Christian believer (he may be Jewish, but devout or secular I can’t tell), continually attempts rational explanations for healing & miracles attributed to her, and is obviously enamoured with Aimee Semple MacPherson. He’s also written bios of Edna St Vincent Millay & Nat King Cole.
If the library doesn’t have them in their own collection then remember: most (99%+ libraries participate in Interlibrary Loan [ILL], meaning that they can borrow books from any other library, usually free of charge and never for a more than nominal [e.g. $1.00] fee). Just ask whoever is at the circulation desk and they’ll know what you’re talking about; it rarely takes more than a week for the book to arrive and is usually quicker than that. (Academic libraries tend to be quicker than public libraries due to statewide consortiums.)
An interesting project might be to read the autobiography AND the definitive biography of the same person to note differences. (For example, Charles Lindbergh skirts around his pro-Nazi sympathies in his autobiography and doesn’t mention his many infidelities [he had, in fact, an illegitimate family of three children in Germany], while his biographers almost obsess on this fact; there are several good biographies of Malcolm X that challenge some of his autobiographical statements [i.e. he not only knew there were white Muslims before Mecca but had talked with them at length while working for Elijah Muhammad] and include interviews with his siblings, friends [both before and after he became Muslim {either the first or second conversion}] while still portraying him as a fascinating and admirable man.)
No idea your age, etc but besides *Malcolm X * (what an eye-opener!) and the *Katharine Graham * book, I also recommed the autobiography of Maria van Trapp (the Sound of Music family). Can’t remember the name but I am sure you can look it up. I read it in 7th grade but it was a big read (not on a 7th grade level) and an interesting story. (Not at all like the movie; the dad really wasn’t a jerk.) It talks about their life in the US once they arrive, too.
I really enjoyed Ava Gardner’s Ava: My Story and I also really liked that book that Tracey Lords wrote discussing her life, and her involvement in the porn industry.
I’m disappointed nobody here has mentioned her yet, but this board’s own Eve has written several biographies. Look here. Theda Bara looks good (So does the book! 
), though you might prefer Harlow.
If biography will do, read The Professor and the Madman. If it doesn’t, read it anyway.
Yes, I Can is Sammy Davis Jr.'s autobiography. Read it, but read his follow up many years later (Why Me?), which is a lot more honest about his flaws, and illuminates a lot of stuff from the earlier bio that got glossed over.
Big Bill is the biography of one of the greatest tennis players of all time, who also liked little boys. One of those “painful to read” books, as you can see the flaws break down the greatness.
Surprised by Joy is the autobiography of C. S. Lewis, one of the great Christian writers. Read it, and then (if you can bear it) read A Grief Observed, as he struggles to survive the loss of his wife and the happiness he never thought he could find. Heart-breaking, and with one of the most devastating first sentences in literature.
Joe DiMaggio: The Hero’s Life is another baseball biography. Not as good as the Cobb one, but insightful even to this non-baseball fan.
Good luck. Biography and autobiography are among the most fascinating subjects in literature.
Regards,
Shodan
Howard Stern’s Private Parts is hilarious. He details how insecure his life was until he broke into radio, then goes into how much of a complete bastard he became in order to get national recognition.
An interesting autobiography & sequel is Loretta Lynn’s Still Woman Enough. It’s not only a sequel updating her life since Coal Miner’s Daughter but in many ways is a re-write of CMD, telling “the rest of the story” on some points that she didn’t feel at liberty to address at the time (her husband’s violence, her drug use, etc.). While as with its predecessor one still comes away with feeling “Damn! That woman is dummer than a hundred chickens…”, it is nevertheless an interesting read. (Loretta was 29 when she learned she was going to become a grandmother- that’s almost impossible to grasp.)
You are absolutely correct. Entirely my mistake. Sorry! 
Well, since I’ve got your attention, I was originally going to suggest Cynthia Griffin Wolff’s biography of Emily Dickinson but held off when I re-read the thread title.
But since you’re able to use biographies as well, you should check it out. Wolff’s a big Dickinson scholar, and she looks really closely at the extensive amount of letters and correspondences Dickinson wrote. (In fact, the best praise I can give the work is that after reading it, I kind of got a bit of a crush on Dickinson as the young Amherst College student. How pathetically unrequited is that? )
Another vote for Harpo Speaks! He meets George Bernard Shaw, and in 1933 he was the first American entertainer to go to Russia after the Communist Revolution (and you’ll find out what “Exapno Mapcase” means).
Where is Eve of late?
I second the Zappa book and third the Foley.
Another autobiography I loved was Martin Amis’ Experience.
It’s called The Story of the Trapp Family Singers and it’s a great read.
Another good read is The Family Nobody Wanted by Helen Doss. It’s the story of a Methodist minister and his wife (Helen Doss) and the family of 12 children that they adopted, 10 of whom were considered unadoptable because of racially mixed backgrounds. I promise you will love this book. G