I ruined my life.

I'm gonna go ahead and say you (referring to people in general, not necessarily -Spector-) can do drugs and drink alcohol and not ruin your life, so the whole "stay away from drugs/alcohol" statement is for the birds. I drink socially and do drugs and my life is fine. I hope things get better for you soon, as much shit as I give you I still don't want to see you hit rock bottom. You just have to keep in mind that tomorrow can always be better, you are the one who determines that outcome.