advice please

Madi

okay so me and my boyfriend have sex quiet a lot but he never wants to use a condom which makes me extremely nervous due to the fact that im only a sophmore in high school and babies are not on my want list atm. how do i tell him to use a condom? ( whenever i have mentioned it to him in the past he says that he doesnt enjoy it as much with a condom, and if i get pregnant hes fine with it but im not)