GIRLS!! how do i get girls to actually want to go out with me?? Help PLEEASE!!?

im 14 going on 15, and im in 9th grade and im overweight, but i have a great sence of humor and i shower twice a day, and i think i dress good (polo shirts and nice jeans?) i have asked girls out but i get a constant "NO!" i get good grades, i dont wear jewlery, all i wear is a nice seiko watch, whats up? it seems like im the only guy without someone to love, i dont play sports, although im thinking about football, or baseball, i have a ton of hobbies including hunting and fishing to model rocket competitions and building every kind of air or hairspray cannon (spud gun) imaginable, do i just have to loose weight? HELPP!