Should I text her

My bf of a year and a Half, and I had to break up. His mom thinks I'm a horrible person Bc I've drank twice and tried smoking once. I hate myself rn and I'm trying to improve. I wanted to tell her that yeah I've made dumb mistakes, but hasn't everyone? that she shouldn't let this define me as a person. That I've gone through so much stuff people our age have never had to deal with, and it makes it even harder when she reminds my bf,  convincing him to leave me, when instead he could stay and help me become a better me. It's so hard to become a better me when she's remaining people how I made dumb mistakes and when she's taken away my main sense of motivation, besides the fact I absolutely hate myself,