I NEED HELP WITH SEX !!

so my boyfriend wants to have sex , we are both virgins and want that to change. i want to have sex , but i am scared of getting pregnant !! im not old enough nor ready for all of that , he also wants to do it raw because it is a "better sensation" or so everybody says. i want to have sex and i want to make it feel as good as possible , but i just dont want to get pregnant , what should i do ?