Whats in a picture on a dating site anyway? just coz they look your type in a pic doesnt mean there gona be your knight in shining armour they cud be asses.
Dont let your weight discourage you tho, ull be amased at how many men dont really have a preferance its confidence they get attracted to.
Another thing if you think ud be settling by metting the ones that yor talking to then.............DONT TALK TO THEM. Ur only building their hope up.
Take the plunge and talk to sumone u feel attracted to if nothings happening step back for a few days and let the men do the contacting.
Also ull only learn to love yourself by gainin confidence , so get out and meet new people its much more liberating, and ull feel more confident and attractive once u start getting attention on a one to one basis , not over the computer.
I do hope you find some one loverly to ge a date with and remember in the words of GOK WAN "its all about the confidence"