I was bullied all through elementary school and was called a loser in middle school. Middle school was pretty sad for me. I mean it wasn't bad to the point where I got into drugs/sex/etc, or any of those things, but I was lonely completely. Even though people told me they were my friend or were nice to me because I didn't make fun of them, none of us really ever did anything together outside of school. So I can't say I had any "best friends" in middle school.
High school isn't really that bad, but of course, I'm home schooled part time so I guess you could call me lucky. Although, even if I wasn't homeschooled, it's not very common in this particular school to actually make fun of you. Though maybe if you're hyper or act all mean then people will start saying, "Wow...you're ret*d..". And this of course is when the teachers aren't around.
The minuses to my high school though is that because it's a private, religious school it tries to be "perfect" so when someone acts out, people can go "WTH?" And in high school, I really don't have any friends that I actually go out and do stuff with. I always had to direct conversations anyway, so it gets annoying and tiring.
So was I ever a bully? Maybe once or twice in elementary school, but no I really tired hard to laugh or be mean at anyone. Simply because I knew what that was like. I just thought, "Well, if I don't like being treated cruelly, why would I be a bully to anyone?"