(I know this post is long so I'm sorry) So my brother was bothering me as usual but tonight I don't know what came over me but I got furious and started hitting and bitting myself hard and then started breathing quickly my brother watched all this go down and told me his going to tell mom tomorrow if I didn't tell her myself and that I should see a therapist, I don't want to tell my mother about this because I know she will feel like it was her fault I don't want her to feel like that, I don't want to see a therapist because I don't want them to feel pity towards me or think I'm stupid or  for doing that. The thing is this agresión towards myself didn't happen in a long time like almost 6years or more and my reasoning was that my grades were shit I didn't have any worth so I deserved the punches I gave to myself and recently not today it happened again because I didn't feel capable of doing anything right and tonight it happened again and so I want some tips to how should I tell my mom without her thinking it's her fault, I'm really freaking out and thank you for reading.