I'm having sex with my boyfriend next week, but I'm a virgin and he isn't.

I don't wantto dissapointed him of the pain is too much, and also don't want to have to go through the possible pain whilst were together. Also, I'm really paranoied about the bleeding. Would or be a good idea to 'pop my own cherry' through masturbation before we have have sex? Btw, I've been a horse rider for nine years. Could this affect anything ? Thanks.