What is wrong with my shoulder?!

What is wrong with my shoulder?

My shoulder has been messed up since about 2 weeks prior to spring break. I don't know what I did to it but I can't put a whole lot of weight on it anymore and I tried to bench 140lbs and I couldnt even get 85lbs anymore. It also pops and grinds like crazy when i rotate it. If anyone knows what may be wrong please help me.

4 weeks ago
When I try to change my shirt or do something that involves overhead movement it hurts like all get out. I'm not sure when or how I did it but I race atvs and i also throw shot put and discus and I play football

Sounds like it could be rotator cuff syndrome. Torn or pulled ligaments or calcium deposits in the shoulder bones. Better see a doctor and maybe he will give you treatments to ease the pain or cortisone shots. Good luck, very painful have had it before.