Okay, so I have a couple thoughts:
1) The first thing really needs to be some open, honest communication. When a sexual partner doesn't know things aren't working for us, they're just going to keep doing the same things that same way, so we're going to find ourselves stuck feeling like we have to keep doing those things. It's a pretty sticky, shitty cycle. But also, we can't have healthy, mutually satisfying sexual relationships if we don't tell each other what is and isn't working. What do you think about at least sticking your toe in this conversation with him? What do you feel like you need to have it?
2) How about if you do that, the next thing you propose is that you two work to balance out who is initiating what? One way to do that in the kind of pattern that has been established here is for the partner who has been doing all the initiating (in this case, him), agrees not to do any for a set period of time, like a couple weeks, allowing you to -- but only if you want to -- initiate what YOU want and feel comfortable with. I also want to add that having previous experience with other partners doesn't mean someone knows what to do with someone new. When we're good at being sexual partners, we usually really do learn almost anew how to be sexual in every relationship because we're all so different as individuals and in combination.
3) If you don't feel comfortable talking to him at all about the sex happening but you're having it, that suggests to me that sex being in this probably is too fast for you. In other words, the pace this happened at probably wasn't right for you if you feel too nervous to talk about the things you're doing, you know? So, in the event what you feel best about or want is NOT to be sexual yet, I want to make sure you know you get to ask for that. Just because sex has happened in a relationship doesn't obligate anyone in it to continue being sexual, or sexual in certain ways, together.
How do you feel about all of that?
Never doubt that a small group of thoughtful, committed citizens can change the world. Indeed, it is the only thing that ever has. - Margaret Mead