I don't know what to do.

Okay, so my boyfriend and I have been together for a while, and he was also my best friend for 4 years before we got together. So, yeah I felt comfortable going into the relationship. Well, yesterday we had gotten a chance to be alone and we did a few things, but I found out that he had never actually had sex before. And i have, and that makes me feel kinda bad. Like, I don't want him to feel obligated to do anything because i totally understand if he doesn't want to, but I'm not entirely sure how to get him comfortable enough to do anything. Or when to know he is comfortable doing anything.