What do I do?

What do I do? I need to stop sh and starving myself and sleep depriving myself but I can't because this world is cruel. I hate it here. I'm very young but I don't know how to tell people my problems because they'll be like "same" of "fr" and it ticks me of so bad I just start to stab myself with pencils and pens and dig knives into my skin and I want to stop and everytime I try something or someone always has to come tick me off!