How do I stop my suicidal thoughts?

I have nobody to talk to. Every time I try to talk to my mom she gets upset says stop and leaves. I have been cutting and burning myself for 2-3 years and the only thing I can think of is suicide and harming myself. I have been on anti depressants for awhile and I have a therapist who knows everything. But even my therapist does not help that much. She changes subjects every 5 seconds even when im not done speaking. Its like nobody cares about me.