Why does sex have to be so tempting? HELP!!!!

So me and my boyfriend are really young. We have already had sex, but we had a pregnancy scare. Now he says we need to wait. I know we do, but I have started birth control and we use condoms but he is still afraid and says he might want to wait till marriage. Honestly I don't want to wait. We already did it a few times and we now have birth control too. At first we just had condoms. Instead he wants to try to do anal again. I don't want to because we did this before real sex and I love real sex much more than anal. Anal is so painful for me but he likes it. We both want to have sex, he just thinks we need to wait. I know we are really young, but I'm not afraid of getting pregnant. The first time when we thought I was he promised on everything he would never go anywhere. I am so in love with him and we've been through so much. I'm not scared. Should I tell him I want to or should I just keep waiting? He is completely against the idea of doing it now. What do I do??? Since then we have gotten promise rings and I know we will make it. We are freshman in high school and honestly married we really just haven't had the wedding it feels like.