Help!

So I have started seeing a new guy. And we both want a relationship. We haven’t had sex yet but on New Year’s eve, well I should say New Year’s Day, it got very hot and heavy(but of course I was on my period) and he is very big... and it worries because I’ve only been with two guys and they were very very small....... I told him that I have faked orgasms and all of that. But he noticed that I liked it when he got fairly rough and he keeps on innocently teasing me. But I just need help. Please. I want it, but I’m scared. So any advice you can give me I will take it!