Weird Ankle Pains. Any Ideas?

im in 10th grade now. & when i was in 6th grade my basketball team was having a scrimmage. & obv. as you may know at the beginning of the game you jump up fr the ball, well i was one of those people. i jumped up, & when i came back down i landed on the side of my ankle. It kind of rolled i guess, & i walked it off. Then the next morning i woke up & i couldnt even walk on it. it was really swollen & everything. I went to the ER [& i dont remember but my mom said they took xrays of the bone & said nothing was really wrong or something] & told me to use crutches for 6 weeks. i ended up gettng off them the next day cause i wanted to be in the championship game. and i did. now 4 years later; my ankle gets really swollen every other week. & it hurts to wak on it. & when i twirl my ankle, a really sharp pain comes. & and if i roll it, it hurts more then what my left does. Any ideas what it may be?