Well if you fear you are pregnant then you just need to test, periods can be missed for a number of things, stress is a big thing that will keep it at bay. You should however see a gynecologist to find out what's up and get on some birth control if you're not looking to have a baby. Good luck honey.
that's the hard part to explain, im actually afraid to have sex it freaks me out completely and as a grown women I should not feel this way but I do, but my boyfriend and I have been trying slowly get me to, but he still has not gone in all the way, most of the time its protected but there has been a few times where it was not
I suggest you go see a gynecologist to get to the bottom of it.
Have you had unprotected sex