If in doubt, you need to reassess the situation.
It looks as though you really do love him. It is best to wiat for marriage in my opinion. Remember, its how you feel about it that counts. Don't let him pressure you into it. Let him know how you feel first and discuss it together. That's true love. Once this happens, sex will be so much nicer, sexier and more orgasmic! If you get those horny feelings, have sex subtitutions - body rubbing, kissing, watch something romantic...imagine the possibilities...