I slit my wrists...?

Go to the ER and have them take a look at it. But if you can't then I would go to the store buy alcohol, gauze, st airy strips, and some tap. Clean the cut very well. Then out a lot of pressure on it for a long time to stop the bleeding. Then put on the starry strips and cover with gauze and tap. GOOD LUCK. If I were you I would still go to the ER if you don't want them to tell your parents I don't think they will patient doctor privilege maybe.