Wanting attention from other guys

Through my teenage years I was never the kind of girl that attracted much male attention. I was quiet, had very particular interests, and was kind of intimidating to guys I think. I only got asked on one date (by someone I didn't like, lol of course). I also had a bestie who outshone me in the looks/charm department, so any guys who hung around us were usually so distracted by her that I was never anyone's crush. It affected me more deeply than I thought it did, and to this day I feel inferior to other girls. 

In college I met my boyfriend, and he makes me feel special like a good one should. :)

Yet sometimes, I find myself craving that initial attraction sort of attention from guys, like the "Oh, she's pretty and interesting, I want to get to know her," sort of thing. I know my boyfriend thinks those things about me, but after 3 years and some significant weight gain on my part, it's not quite as ego-boosting for some reason. 

It sometimes gets to the point where if I receive attention from any other guy, my mind can start to go a little wild. Is this really bad? Should I not be entertaining these thoughts whatsoever? There's no doubt in my mind I would be incredibly unhappy with anyone but my boyfriend, but I sometimes can't stop daydreaming about random guys confessing their love to me and whatnot. Oh well.