Age is only a number, right? (16yo)

I'm about to end my life, I've seen some fucked up things in my life. Things that not even a grown man can stomach among seeing it face to face in reality. I've been through more then my whole family combined, and still try my hardest only to be broken down over and OVER again. Things I don't even have the strength to sit down and write into words because if I did, it would take hours. And people keep telling me I'm "still young" and I could care less. People say age is just a number, but is it? Is it REALLY? because in my eyes. It is.