What Causes Pain And Bleeding In Tail Bone Area?

Hi im jason im 18 and my tailbone has been hurting for about 2 weeks. It comes and goes all the time accompanied by alittle blood when I wipe but only SOMETIMES, it goes away for a good awhile and then it comes back for a day or 2, but then it goes away again. it hurts most when i am sitting down. it does not hurt when i bleed either and the blood is minimal and bright red. I cant seem to touch the area of pain. my pain seems to be inside my anus but it hurts above my anal hole where it connects to my crack.