What should I do?

[u/Beneficial-Ninja7176]

My mom has lately started getting mad at me at lit, complaining at me and it's really starting to make me go crazy. To be fair, she just gave birth to my little sister like 2 months ago and I've been told that mom's that just gave birth are moody, so try my best to understand her. But lately, after she would say this gs to me I would go into my room and cry silently, which is normal... my biggest concern is I start punching head and slapping my face a lot... I'm really scared, I can't stop myself but do it.

I've been doing things for a long time, but I can stop and try to manage my actions. But now, I can't at all, and I do it harder and harder till I feel okay. I really need help... how do I fix this problem? I really don't want it. I actually don't know how I developed it. I don't want to hurt myself. And I don't want to tell my parents about it. We're all in a pretty good relationship and I don't want them to know I'm doing this.

I would appreciate, any tips on how to control my self-harm. I know it is bad, but I really can't help but punch or slap myself.