So...is it broken or bruised?

I was at a track meet on April 2nd and i was getting ready to triple jump, so i was warming up on the turf in the infield when I slipped and fell RIGHT on my butt (the turf was wet with dew). Ever since then my butt has been hurting. When I sit a certain way or get up from sitting on the floor with my back against a wall, it hurts badly. I haven't gone to the doctor because it's my tailbone, I don't want anybody looking at my behind. I'm not sure if it's broken or just bruised. If it's bruised, how long does it take to heal? If it's broken....well I need to go to a doctor (even though I don't want to). Help?