I'm 13 and I have blonde hair. I want to dye it black but I'm afraid that it might become permentet or ruin my real hair color... will it??

Sweetie, I don't recommend dyeing your natural blonde hair black. Black hair dyes can leave a permanent tint on light or blonde hair, and you may need to bleach the black pigment out in order to go back to blonde. Some girls would be happy to have your hair color. I hope you decide to keep it.