As for me, I grew up thin and got fat, so I was never really bullied. But I do hate it when people will come up to me and ask me if I've lost weight when I'm just trying to suck my stomach in. >__<
If you ever need to talk about it, or need... I dunno... encouragement, just hit me up. :)
You should watch the True Life episode on MTV called "I'm Proud to Be Fat". Not saying you're fat. Just saying that it helps a lot with acceptance. I was really chubby a little while ago and watched it and it made me feel great. I still lost weight, though, because I'm just the kind of person who looks horrible chubby, but it did help me with thinking "Maybe this was okay for some time."