because...they feel bad about themselves so they try and cover-up whatever is bothering them!
Depending on age, your relationship, your past sexual history, and overall what you really feel about sex, many things can be a factor. Some women never have an orgasm with just intercourse and need clitoral stimulation. Don't be afraid to let your partner know if you aren't getting fufillment out of sex.
try having your motor mounts checked out
I think you should just come out and tell them. Age has nothing to do with it.Im twenty years old and im currently 7 weeks pregnant with my first child.I am living with my boyfriend and also take care of a two year old from his previous relationship. I think at your age you have to be resposible for your own actions.Its your body, as well as your future.You have to have a plan and stick with it.If you are not for an abortion you should really talk it over with your parents and let them know that you want to have and raise your child.You have to be the responsible one because after all the baby will be depending on you.Its good to have support form your family but your child will be your responsibility.You really should talk to them now because if you plan on having your baby they are going to find out sooner or later.