Whats wrong with my joints?

i know i should go to a doctor and i`ll get around to that, but i just really wanna know what`s wrong with my joints. i`ve beenhaving trouble with them for a little over a year now and i thought it was maybe from cheerleading but i`m not sure. my left knee feels like it`s constantly under pressure, like something is pressing right on my kneecap. it also burns and tingles throughout the day, esp after walking. it`s sensitive to the cold too. my ankle sometimes feels like needles are pricking it, and has a similar sensation to my knee. my right knee feels like a door hinge that needs to be oiled. ha i know this sounds like a laundry list of ailments but i`d reaaally appreciate some insight. thanks.. i`ll see a dr soon enough