I NEED ADVICE ON HOW TO QUIT MAKING THE SAME MISTAKES OVER AND OVER !?

I've gotten in trouble a lot ever since my mom and dad divorced not that I hadn't gotten in trouble before.Recently my mom has been struggling to pay bills and deal with her own emotions. While all this has been going on I took like 22 of HER xanax, charged 54.00 dollars on paypal that was turned over to a collections agency, and just today I got caught shoplifting and was charged with a class A misdemeanor. My mom is at wits end with me. I keep making the same stupid mistakes and she thinks that I am only thinking of myself and being selfish. How can I help my family and convince my mom that I care about her and my sister. I've been nothing but a destructive force in my family and I feel like a worthless piece of **** and I really wouldn't mind dying. PLEASE HELP URGENT!