Iota saidBe who you are...if the guy is as pretty as you say then great, but tastes are different for everyone, he may think you are breathtaking even if you don't think so. If looks are a that big of a deal breaker then its not meant to be and all the surgery in the world can't fix that. Be confident in who you are and the right guy will find you. I know plenty of couples that were brought together because of their looks but don't have any other compatibility. They fight all the time and are really difficult to be around because they are staying together for the wrong reasons....
Sure, it may be true that most "pretty" boys date other "pretty" boys but that's not a 100% absolution because guys can have a range of different likes. This is example IS NOT very common but I remember browsing A4A once and came across a young bodybuilder who you'd expect wanted to find someone like him but he said he was only attracted to fat, hairy, silver haired daddies. Now, who knows why he had that attraction to someone so different from him but this goes to show that you never know who is attracted to who.
Again, yes, this isn't very common in the gay world compared to the hetero world but that doesn't mean it doesn't exist. Heck, for all you know, the supposed hot guy may like someone who isn't considered physically hot to his friends/group and thus, doesn't want to act on it. You see this with the secret chubby chasers in the hetero world. Guys deemed attractive who have a liking to overweight women but due to social stigma, don't act on it or if they do, they do it behind closed doors.
Anyway, just try to find inner confidence in yourself. If you want to lose some weight, lose some weight or vice versa. But as far as face goes, I really wouldn't risk having a full retouch because it can either go good or horribly wrong.