To that, all I can say is “practice, practice, practice”. It’s entirely possible to train your voice to go higher.
After my voice changed in my early teens, I was proclaimed a “bass” by the choir director at church. He checked my range, and found I could reach down to a low E (open low E-string on a guitar), and that I topped out at the A just below middle-C. Now, that was just fine if I wanted to be country singer - which I did, later, but at the time I wanted to sing rock.
I was into The Beatles at the time, and so I sang (or tried to sing) their stuff. Eventually I had stretched my range enough to sing their stuff. Then, later in my teens, I got into bands like Rush, Judas Priest, and Iron Maiden. I heard these singers and really really really wanted to be able to sing like that. I discovered that Rob Halford and Bruce Dickinson had naturally deep speaking voices, and I figured that if they could turn around a scream like banshees, so could I, if I tried hard enough.
So, I sang and sang and sang with these records (driving my parents batshit insane in the process
) until, eventually, I was able to consistently hit high E, i.e. 12th fret on the high E-string. And I’m talking about singing full-voice, not falsetto. It was nice being able to say I had a full three-octave range 
Of course, now that I’m 40 I can no longer sing quite so high; I top out around the A or B above middle C. On the plus side, even though I can’t reach the highest notes any longer, the overall quality of my voice at the upper end of my range is better now.
Of course, by the time I was finally happy with the way I sounded in the upper register, there was a paradigm shift in rock and all the singers started going low and growling like Cookie Monster. Sigh.