I'm not sure what to do, I'm really upset with my friend.
Why are you so upset with your friend?
He's pressuring me to move our relationship from friendship to intimacy and I'm not ready for that.
Yeah, I understand why that would make you upset. You should be direct and tell him no and if he keeps pressuring you then end that friendship. He clearly doesn't respect you enough to listen to how you feel.
I still really like him as a friend and don't want to lose his friendship.
I know how difficult this is for you, but you should be very clear with him. Tell him you want to be his friend, but that's all. Real friends don't pressure friends to do something they don't want to do.