I have a tic, it is shaking my hands/wrists violently and then i smooth my legs down quite hard. I can control these urges infront of people as i am aware i may look weird doing it. But when i am alone or infront of my family/close friends i do it because it seems irresistable and i feel better for doing it. I am frightened i will damage my wrists with all this shaking but embarrassed to bring it up with my doctor. I have been doing it since i was about 6, i am in my twenties now..
Why don't you just go and see your GP. You could just have a Tic, but maybe you have a problem with your Nervous System. Whatever the problem, you can be referred onto a specialist, who may be able to help.
Doctors are used to all sorts of embarrasing problems and will not judge you or think you are weird. The sooner you see your GP and find out what is causing this the sooner you can begin working on controlling it and getting your life back on track.