It goes the other way around, you need to care about yourself or no one will. How do I know this?
A) I've been in much the same situation as you, my friend. I was in a dark place and didn't much care what happened or what others thought. Now I care, and now I have a decent little circle of friends.
B) That's what the judge at bond court my Criminal Law class went to said while giving a poor girl who'll probably spend the rest of her life in and out of jail a date to show up at an actual court.
Homeless, hooked on drugs, a prostitute. Her parents didn't care about her, she had no home, no friends, no nothing.
Because she didn't care what happened to her.
Do you want to end up like that? Or worse?
Again, it's a VERY big world out there, my friend. It's easy to feel overwhelmed, but if you can push through this, you can do just about anything.
And put down the gun. It isn't worth it.