SUBREDDIT: r/relationships
TITLE: Boyfriend[24M] says I[20F] don't "participate" when we have sex
POST: My bf and I are starting to get more sexual and today we decided we were going to have sex, however, he stopped mid-way after he lost is hard on and said he didn't want to anymore because he didn't feel like I was enjoying it; because I wasn't participating and was very quiet. I felt so bad because I certainly did want to have sex with him, I just felt a little nervous. I don't know what to do, because I am naturally a quiet person and am shy when it comes to all things sexual, and he has a lot more experience than I do. How can I show him I really want to have sex and to "participate" more, and be less quiet?
TL;DR: 
Boyfriend doesn't think I enjoy sex, don't know how to show him I do because I am naturally very quiet and shy when it comes to sex.