Or, if you get garbage parents or no parents or born in a war or something, you don't even get any say in totally fucking it up. It's already fucked for you.
Welllllllllll, usually not quite. There's not much that can happen to truly fuck up a life in an irredeemable way. You can make choices that prevent you from being able to reach best outcomes A, B, or C, but at basically any point you can still achieve good outcome X, Y, or Z.
Such as how? Like even if you've been sentenced to life in prison, as long as you're not put in a supermax there are still ways to wind up with some ok outcomes. You can earn some pretty decent privileges like a music player and a tv, you can become a big reader, you can earn a law degree, you can use that law degree to help get innocent wrongly convicted people out of prison, etc.
Seriously. It's easy to look at where you're at today and think it'll never get better, but 60 years is a long ass time. It only takes one or two good/lucky decisions in all that time to start to seriously turn your life around.
I'm only 30, but looking at 20 year old me is like looking at a completely different person - a person that absolutely thought he had fucked up right out the gate. Just keep living your life the best you can, and you'll get there in time.