My legs are feeling so achy =/

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I got off work a few hours ago and I've just been sitting around ever since. But for some odd reason my knees are feeling very achy. I don't know why, I'm only 20 years old. I really don't think it's from standing at work..I've worked more than 10 hours straight once and my knees have never felt like this. I'm really not sure what it could be. I feel like I've always had knees that are kind of bad and it's probably from all my horseback riding and showing. Whenever I bend a knee, it cracks. I can lay on my stomach and swing my legs back and forth and my knees will crack every bend. I'm not sure if that's related to the pain I'm feeling tonight though. I'm feeling a bit lazy now but maybe in a little I'll get up and get some Tylenol or something to help with the pain.