Loosing self-esteem over size

I'm a very big person (Not really fat just tall and have a big frame) and all my friends have been getting girlfriends and girls have very little interest in me and aren't attracted to me. I'm kinda pissed because I don't want to be the only one of my friends with a girlfriend. Are there any other diet plans I can go on to lose a helluva lot of weight before the school year ends in June. Are there any muscle gaining techniques I can use I really want a nice set of abs and upper body. Also does full body weigh loss effect your fatty face area because I have kinda puffy cheeks I'd like to get rid of.