Psychological problems. Is this normal?

Hey, Good that you are clearing this doubt, which if left uncleared would have reduced your confidence level. Firstly let me assure you that there is nothing abnormal about you. Most of our thinking and behavior depend on the sort of upbringing we have, norms of society we live in and the type of exposure we get along with our basic temperament. The conception of right and wrong in a person is mostly created by society she is part of. Though our culture as well as media is westernized, it's extent and effect is different on different people. Again, a girl could be more shy in matters related to sex than a guy. For her sex could be more about expression of emotional closeness than an activity involving bodies. As you grow, you will explore further into life, leading to expansion of your belief system in many things including the ones about sex. At this point, you would be curious as well as nervous about sex. Your nervousness about sex does not make you a closed type. Taking a stand rather makes you assertive. Please do not hesitate to communicate to your boyfriend further about your uncomfort till he gets what you are saying. Also observe yourself when you are nervous and keep exploring reasons for your nervousness. Do not take any step in the relationship out of insecurity or pressure. Take Care.