While I suspect the degree of disaffection with grad school seen in this thread may be a little skewed, an awful lot of people attend grad school as a way of putting off making decisions about getting a “real job” and hanging on to that undergraduate experience.
Also, having a good relationship with your advisor, and compatible approaches to life, research, etc. makes a huge difference.
I attended a wedding of a friend from grad school a few years back, of the 9 people around the table, I think only 2 or 3 had PhD’s and were working in their fields. 2 had PhD’s but were not “living up to their potentials” and 3 had never gotten their PhD’s.
While that group of us is really skewed towards either the unsuccessful in grad school or sucessful in unexpected ways, the reality is that a lot of people who appear to be happy and successful have made poor choices in the past, that you meeting them in the present are unaware of.
I’m not recommending you drop out of grad school. But I do think that you should be aware that dropping out does not automatically render you a failure, and dropping out sooner will mean that you have dedicated less time to a dead end than waiting until later will.
It takes courage to change course midstream, and courage to recognize that the course you have shifted to may not be the right one.
On the other hand, when I read your OP, I assumed you were in a literary field and boredom with reading about literature struck me as a really bad sign. Boredom with reading scientific literature is a less clear warning sign, as it strikes me that there is more room for stuff that isn’t reading scientific literature in your degree program.
Still, I stand by my advice to be as well informed as you can be about whether this program will in fact in able you to do the job that you think you want to do, and whether the rest of the program is more appealing than reading more quantities of literature.