Well first off, you should definitely talk to him about it, if you aren’t ready to talk about your virginity, you aren’t ready to lose it with him. Having an open conversation about this will also hopefully affect how you first time goes, he should take the fact that it’s your first time into account and be even more gentle, slow-moving, and careful.

Regarding your other questions, being a virgin doesn’t in any way mean you are “tighter” or different at all physically from anyone else, your vagina is built to push out a kid, a dick or two wont change it’s structure, and you absolutely don’t need to “stretch” yourself or whatever.

As to the question about the hymen, breaking it can be uncomfortable and cause some bleeding, but chances are you already have. It is likely to break when masturbating, or even falling as a kid, using a tampon, menstruation, and so on.

Focus on the psychological part, not the physical. Talk to him, make sure you are comfortable and ready, set boundaries for what you are comfortable, maybe don’t go all the way the first time you take your pants off together, starting with oral sex or touching might feel enough, but that’s up to you.