Mom caught us

Well I've been with my boyfriend around two years and recently we have started our sex life. Before that, my mom caught me in the lap of my boyfriend sitting with my legs open. We had the ugly conversation and then, a few months later she caught us again but he was eating me out! Omg I've never feel so ashamed. I don't know what to do with my mom or with my boyfriend, it has become really uncomfortable between my mom my boyfriend and I since then. I just want to hear some advices. By the way, I'm 17.