Please answer this girls 😭😭😭🍆💦

I want to have sex with my boyfriend soooo bad. We've been on and off for almost two years now . I'm 16 (almost 17) and he recently just turned 19. I'm also kinda shy about asking about these things but how do I come about telling him I'm so horny? Also I was wondering if there Is a chance I can get pregnant. I have had two birth control shots in total and got my lady one last month so is it possible? It happened to my mom time she missed one of her shots..