Um, 75lbs???? Wouldn't that make you like, 60lbs? My little brother going into 4th grade weighs more than that. You're pretty short, so I wouldn't go any further under 80-85, I don't think I'd go that far either really. If this guy you like doesn't like you because you're overweight, screw him. There's much better looking guys out there, besides, you're only in 5th grade, find out who you are, and then find a guy who likes you just as you are. But that doesn't mean I'm discouraging you from losing weight (maybe not so much!) But yeah, if you aren't happy with the way you look, change it, more power to u. :-P But don't go to 60lbs. So just diet and exercise, and don't go for that guy if he likes you in the end. He won't be worth it. And for the 170lb kid, shake him off. Just ignore him, act like you don't care (look confident all the time) and he'll go away. Trust me.