Problems during sex for the first time

So, my boyfriend and I just recently lost our virginity to each other. I didnt orgasm, but I always have a very difficult time orgasming (even when I masturbate) so I didnt think much of it. However, he didnt cum. Later on, I gave him a blow job and he came, but I still feel terrible about not being able to make him cum when we were actually having sex... He told me that it wasn’t my fault and it was because of himself and because his dick kept on sliding out.... (we didnt warm up much before tho... we just went straight from making out to having sex). Is this normal? Idk, its just super embarrassing. If you have any advice or some tips & tricks, that would help a lot!!!