Yes, I agree with the others. Him pressuring you like that is a very good reason to dump him, because although you may get on in many ways you don't seem to be compatible in terms of the intimate side of things.
Trust me I know how hard it can be knowing that you partner is getting frusrated waiting for sex when you don't feel ready. In fact I'm almost certain thats one of the reasons my ex bf dumped me. I don't know for sure because he didn't say that, but after all times he went on about it I'd be very surprised if it wasn't a factor in his decision to dump me.
I'm only just starting to accept the fact that I either I need a very different type of guy who really loves me, is willing to be patient and wait for me and not be all focused on the sex. Or to stay out of relationships altogether.
I know this is a very hard decision you face and I know you can't imagine life without him right now. I couldn't imagine life without my ex bf either. And it'll take a while to move on of course, but it gets easier, and I know its an overly used cliche, but there really are plenty more fish in the sea.
Of course its up to you, but I'd recommend you find someone who shows more respect for your feelings and is willing to wait. But whichever route you decide I wish you the very best of luck! And remember, you are not alone! There are loads of people out there like you!
"Every once in a while, declare peace. It confuses the hell out of your enemies."
-Rule of Acquisition 76.