You just have to stay grounded. Thin or fat, be who you want to be. You have to realize you're going to get attention and you'll have to figure out how to deal with it. It's not always going to be good either. But you are doing this for YOU and it shouldn't matter at all what everyone else thinks.
They say having a ton of money has its problems as well, but I wouldn't know. I'd like to give those problems a try.