Am I going crazy what's wrong with me?

I get mad over the littlest things I wanna hurt my siblings and I go home and scratch myself I dig my nails into my skin until I bleed because I'm mad I get mad over the littlest things and then I have a break down and almost hyperventilate what's wrong with me what should I do do I need therapy and I can't talk to my parents or anyone cuz they'll be mad about what I say