Im a 25F and ever since I was a kid, any time i am sitting down I tuck my feet up with me or prop them up on something nearby. Doesn't matter if im in the car, sitting on the couch etc. It just feels "wrong" if i cant.

 School was hard because I obviously couldn't comfortably have my feet off the ground. Most of the time I would put my backpack under my desk and prop my feet up that way. 

My legs and feet don't even need to be scrunched up with me, they literally just cant be flat on the floor. 

So i guess my question is, am I alone in this? Does anyone else have this problem? My mom and my sister do the same thing so for a while I just assumed it was a learned behavior, but now im not too sure.