Dislocated Shoulder Cause Arthritis?

I am 22 years old and I get a cold ache in my left shoulder. Could it be arthritis? About three years ago I did something stupid that I think dislocated my shoulder. Me and some friends were fishing at a creek. My friends started to skip rocks, so I thought it would be funny to try to skip a very large (probably 30lb) rock. Anyways, I held it with both hands and spun around in circles a few times. When I let go I popped my left shoulder. It was very painful. I thought I dislocated it so I tried to squeeze it back in. Anyways, I couldn't tell if it went back into the socket because I didn't feel another pop. It didn't hurt as much later that day, and I could still move it. Ever since then, when I move my left arm in a circular motion, I kind of hear a grinding sound. My right arm does it a little bit too, but not nearly as much as the left. Does that sound like I dislocated or partially dislocated my shoulder? Can that cause aches later in life? Should I do anything about it? Thanks!