How the fuck do people cope with being alive?

I really don't get it. I'm 15, addicted to weed & alcohol and have severe depression. I've been suicidal ever since I was 9 years old. Nothing could ever help me. I tried therapy, meds, talking with friends and so on. Nothing made me feel good. I hate the world so fucking much. It's completely broken. I don't wanna live in a place like this.

I've spent the past MONTHS doing nothing but staring at my phone, getting drunk and high, slitting my wrists and sleeping.

I've got no reason to live. I could never reach my goals, I'll never be loved and I'll never be anything to anyone.
Being alive hurts so fucking much.
I can't do this anymore.