consensual

How can I keep from getting upset when he ignores my no?

Elizabeth1
asks:
I'm 15 and my bf told me about a week ago that he thought I should be loosing my virginity and a few days ago I did. I was ok with this and only said once that if it was ok with him I'd like to stop (the way he was looking at me was creeping me out), but it wasn't ok with him so he kept going....