I think I have growing pains but I'm not sure?!

I'm 14 and I'm already about 5ft 6. For the girls in my family, it's pretty common to be a really tall kid but then just stop growing at the age of about 12-14 or something. But recently I've had really bad leg pains like growing pains and it really hurts to walk. I went to the gym the day before I got them but leg pain has never happened to me after the gym before, and I've been there many times. I didn't strain myself too hard at the gym, but I just don't know if it's that or growing pains. I haven't grown an inch in the past year or so.