Why does my knees keep feeling weird?

I'm 20 now, but when I was younger I was really tall for my age and had that "giraffe legs" problem where I would fall all the time. Inevitably I ended up landing on my knees. Now, ever since I was like 15 or 16 my knees get super uncomfortable a lot. It's not like pain exactly, it's just very, very uncomfortable. Like, if I don't move for a bit (like if I'm trying to sleep or at school), they'll start driving me crazy with this like uncomfortable jittery pressure that makes me feel like I need to stand up and start jumping around. To get it to stop I usually do have to go jump around like crazy or shake my legs or something, because if I try to ignore it then it just gets worse and worse. I'm always moving my legs and can't stay still too long, people think I have ADHD or something. I don't know why, but it also happens in my elbow joints too, but not as much as my knees. My friends find it hilarious though, because sometimes I have to stand up after cl and do crazy dances if my elbows and knees are both hurting to get it to stop. XD Is it because I fell all the time as a kid so I damaged them, or...? Anyone have any suggestions for how to deal with it? Thanks!