Poor kid will be suicidal in a minute.
annonymous, 13 is a hard age for anyone. I was like you at that age, bullied, shy, hated my life the works. Thankfully you have come on here and told people how you feel. It might not seem much of a step but you are at least trying to get advice about what to do. When i was 13 I had no one to turn to, computers weren't that common in households (ohh i feel old).
You might think your parents hate you but that aint true, they want to help you and think that by pushing you they are going to help, my mum tryed the same and i thought she was pushing me away. I Think your parents really need to know how you feel, maybe you could write it down if you find it too difficult to actually do it verbally. Your parents probably dont even realise how you feel because most people think teens are supposed to be moody and angry anyways, hormones do that to ya. You say your dad would go mad if he found out you self harmed, that in itself proves he cares, he wouldnt want you to harm yourself. He will probably be very upset if he knew. Parents often get angry with themselves for not noticing how bad thier kids have been feeling. Please let your parents know...or maybe a teacher you feel comfortable with. You can't do this all by yourself. The sooner you let someone know how unhappy you are the sooner they can start to help you.