Trust or not

Been with my bf for 8 months, been really great, when we first met he told me he had slept with someone before, then after we finally decided to do it he said to me that it was his first time and he lied becuase he was embarrassed as he's 19. It was my first time too, and i was fine that he'd already slept with someone, but when he said he lied i didn't know wether he said that to make me feel better or not, i did ask him if i really was his first and he said yeah but was a little hesitant, i dunno whether to trust him or not? It doesn't annoy me that there was someone else, it annoys me coz i feel he's lying to me even when he's said he's not but he gets hesitant and annoyed when i bring it up