Hello KitCat, welcome to the forums.

I am sorry for the way you are feeling right now but it is good that you recognize that you have some problems that need to be dealt with. Going into your teenage years is tough and with all the hormones raging around but self-harming isn't the answer.

You will get good support here but there is only so much that we can do on the internet. You need help as soon as possible. Please go see your Doctor or talk to a counsellor at your school. Or talk to a teacher that you trust about how you are feeling. You do not need to go it alone.

Let us know how you get on.