My boyfriend wont use condoms

Im a 17 year old girl and ive been with my boyfriend for a year now... He was my first and i hope my last but when we first started having sex he always had a condom but lately he doesn't want to use them i do refuse the sex sometimes if I realize he has nothing but on the other hand when you are in the mood you dont care. I dont want to get pregnant, i cant use birth control  and pulling out isn't safe what should i do