Don't let him pressure you into it, you won't enjoy it if you do.
If he's trying to pressure you into it and you're not ready, then he sounds like a jerk.
Losing your virginity is a big thing and you want to be ready for it.. and be with someone you trust and that cares about you. If he's trying to rush you into it, he doesn't care.
Just tell him you're not ready and if he's not willing to wait.. then he's not worth your time.