Hi and welcome to HCM.
This is very strange and uncommon symptom in such young people. It should be evaluated by neurological examiantion and further tests.It sounds like some kind of tic
or nerve damage
and there are ceratin medicines which can help,but as I said you should do few tests called EMG and EEG.
Seconds option is that all these is based on psychological disoreder. In both case, you should visit doctors. WIsh you good health.