I cry a lot for no reason, ill be happy then sad, then angry. My pare to sour a lot which makes me cry, I have to leave the house and be with friends, I get angry easily, my grandad ho I was so close to died 2 days before my birthday, I get easily angered and hit people or shout and it effects my social life. I've thought about suicide. I've cut before and I'm reconsidering, it'd be easier if I could get the blade off my sharpener but the screw won't budge and I'm too scared my parents will find out if I use a knife or razor. What do I do?

You need to dig deep within yourself and understand yourself and learn to control your emotions. Read up on emotions like you are going to college for it. There are so many sites that teach anger issues, self control, etc... You can learn a lot about what makes you feel the way you do. It could be a medical imbalance too so get a check up and talk to a counselor too