Is it possible to skip your period everyonce in awhile??

It is possible to miss your period every once in a while, or for it to be late or whatever. However, if you are having unprotected sex, it is also possible to be pregnant, which I am guessing that is what you are scared of. So if you don't want to be, have safer sex.

Yes. Especially if you're young or approaching menopause age. Some women have irregular cycles all their lives. A lot has to do with individual differences in hormone levels, etc.

I have not had a period twice, if it really becomes a problem visit a doctor, I know its weird and something you don't want to do, let your mom know first see what she has to say, if you don't have a good relationship with your mom then ask a good friend.

Yes its possible to skip. Its also possible to get pregnant with protection or without if you are having sex.