Swelling of joints?

hi. i'm 15 year old female. for the past about 6 months i have had a lot of joint pain. at first it was in my knees and they were very swollen. i got one drained and it never came back. after that my wrists and feet started to bother me. after my fingers began to swell up. my joints all swell up. the swelling will lat for a few days and then go away. i have been put on naproxen but it hasn't helped. what do you think this is? i've gone to many doctors and gotten blood tests and it seems to be fine. i think it may be a possibility that i have juvenile rheumatoid arthritis, but rhe rheumatologist doesnt seem to be sure and apparently it takes a while to diagnose. what do you think? also, if it is rheumatoid arthritis will i still be able to play volleyball and basketball?