It's really hard to judge someone online! For me personally a huge part of a relationship is personality. We have to really click.

Just from looking at your profile I'd say pick a different photo. I think it's possible that it's not your weight or looks so much as your expression. The photo which you chose is pretty static and has a sort of flat feel to it.

Do you maybe have some friends who can take some decent photos of you in some good lighting? If so, I'd really recommend it. Also, smile! Think of something happy or take some photos sometime when you're really having fun. I personally immediately skip over guys who look too serious or sad.

Most importantly, have confidence in yourself. I don't know you in person so I can't comment too much on this for you specifically, but I know that for me it really turns me off when a guy feels desperate, needy, or shows a lack of confidence in himself. I want a guy who is comfortable in himself so we can have fun without me feeling like he needs my approval.