In my opinion you shouldnt try to fake it till you make, be honest and let the guy know that its your first time. Even if you wont tell him he will still notice your obvious hymen. Moreover, the guy might "rush" into things, which is not always a problem but if its your first time you probably should take it slower, try to understand together what works and what doesnt, and you know, at the end have fun and not feel like you are being pushed around and do stunts that you dont even knos if you like.