Birth control pills

İ am 17 almost 18, and i am still a virgin, but i am planning to lose it this summer with my boyfriend who i want to get married to (we both want to get married after i graduate from college). 
İn my culture women lose their virginity when they get married but i want it before, i love him and we are serious. And i cant talk to anyone older. İ need info/help about pills, and what if my boyfriend cums inside of me every time we have sex, would pills prevent me from getting pregnant. (He doesnt want to wear condoms). İ cant get pregnant at this age before marriage. What should i do?