I have been masturbating for a long time. I still haven't gotten my period is that because of mastur

Maybe you are just maturing slower than the others, some get theirs only at the age of 15/16.
But I hope you know that from masturbating you can't get pregnant, thus you don't need to worry about not getting your period.
Enjoy the time while you are period-free, you'll have enough of it later ;)