Thread: I hear a pop in my shoulder?

I was playing football and i was blocking my friend that had the ball. SO this defender who is alot bigger then me rams into my left shoulder. alomst instantly i heard a crack or pop sound it huerted real badly for a minute or two and it was better then i ween tswimmin (This was all in school) n i couldnt hold myself up in the water. so just now I was pulling my shoulder n i heard a poping sound n i pulled again jus to make sure that it wasnt me putting it into place but it makes the sound whenever i do it. what do i do now. i used to be able to tie my hands behind like as if i was arrested and get it over my head into the front of my bodynow i cant do that anymore what do i do help please