I agree with everyone else - if you are asking if you're too young, then yes, you are. Also, please remember that most high school couples do not stay together. You may think you are in love and going to stay together forever, but many couples believe this - even adults - only to find that a few months or years later, it's not going to work. The divorce rate in the us is 50%! That says a lot.
However, your post made me believe that you two have already had sex ("he was a virgin until we started dating.") if that is the case, and you decide you do not want to have sex again, that is absolutely your choice! If your boyfriend throws any crap at you like, "but we already had sex, why can't we again? Don't you love me? Don't you like sex?" then he is not respecting your decision! Just because you have had sex already does not mean that you have to in the future.
And if you do have sex or already are, please use protection: birth control pills or other method, and condoms, since you two are young (i don't mean to be a pessimist, but young people who become sexually active are more likely to get stds).