28 Year Old Male Virgin

Hey! I've been a big fat guy with social phobia all my life, but now I want to get out there and start having sex and stuff. I'm looking to start hunting for a mate by mid-October, and in the meantime I'm trying to lose weight, add muscle, and clean myself up.

I keep wondering and wondering what exactly I should do when I approach girls, because I've never been on a date, kissed or anything like that. So I figured I may try posting at a dating forum looking for advice on how to go about this whole process, and whether or not girls can be receptive to a not-quite-physically-ideal(-yet) male.

Feel free to ask questions or anything. :)