Do you think it's creepy to fantasize about losing my virginity in this manner?

No its not weird its psychological, you cant control certain things as much as you try :p but it will happen the way you want it and with the right guy, dont rush, if you really like him i think you should tell him. And him being older might understand how yoy want to lose it. He is mature and of you get with him and he truly loves you it will go the way u want. Good luck :)