girl, i understand your feeling exactly.
I've been overweight since age 12. by the time i was 20, i was roughly 230lbs. i was the fat friend and never had a boyfriend and oh-so-desperately wanted to have one. even now, i am still a little bit the kind of person who needs a man to validate her (i'm trying to work on it...) and so i KNOW. and i am telling you, that is not a good place to be. because you know what happens when you are this type of person? you settle for jerks. guys who don't treat you right. and you don't do it consciously, you just do it cuz you SO wanna be loved, and you feel that any kind of love is better than no love at all... I am just telling you though, this is not gonna change when and if you lose weight. it has nothing to do with your weight. yes, your self-esteem was built down because of the weight, but once the weight is gone, things don't just magically snap into place and you feel sassy with no issues.
i got my first boyfriend when i was 22. when i met him, i had already lost 15lbs on a diet that would make me lose nearly 60lbs. i was feeling more confident so part of me thinks that's why i could finally open myself up to someone. we were together for 2 years and it was a pretty bad relationship. but i stayed in it because i would always think "if he leaves me, no one else will want me!!", which was completely ridiculous, because by the end of the relationship i was around 170lbs, and pretty sassy-looking (if i do say so myself

). in the end i left him and he came chasing me for weeks. shocking me into realizing that i had the power in the relationship all along..
it took me a long time, many years of dating jerks, of discovering myself and starting to accept my body and thinking that i looked pretty damn fine even if i was still a little chubs, to build that self-esteem back up. and i get hit on a lot and i am flattered by guys, but i still have a problem of man-dependency even though i am not that scared fat little girl anymore. it's hard.
so what i'm trying to say is, you need to work on yourself, on your insides, on accepting yourself as you are and embracing yourself as you are. fat or not. i'm not saying you don't need to lose weight, but what i'm saying is that you won't be magically better when you do. and when you learn to love yourself, or at least accept yourself, you'll find that maybe you don't feel the need to lose as much weight as you thought you did, and you'll find that maybe you'll be able to meet a nice guy a lot more easily than you thought.
i guess i rambled a bit. feel free to pm me if you wanna chat about it more.