Embarrassing question 😣😞

Soooo when I just had sex for the first time me and my boyfriend were both virgins. When we were having sex we did doggy style and he says his dicks too small but I mean I love him and stuff and I don’t really care about what size and if he can’t get it in at first because I had to spread my legs more and he was in the middle of my legs but my question is that, is his dick gonna keep growing ? He’s about to be 16 in a month