Sometimes bullies don't know they're bullies, and sometimes kids get bullied for their own reasons....
Before 3rd grade i used to get bullied, being the only asian in a predominantly white school. at first i didn't understand what they were saying, because I didn't hear such language until I got to school. but it didn't feel right. Anyway, we moved and I got to a school where there was more of a mix of ethnic groups. however the damage was already done deep.
Later I did end up taking martial arts, because it was what I felt comfortable with. I didn't like the mainstream games and sports. so it made me even more dorky. anyway, taking martial arts let me to defend myself when needed, and at times i ended up actively seeking out bullies to put them in line... bullies didn't bother me anymore after junior high. but unknowingly, because my temper was short, i at times could lash out and end up being like the bullies i so hated... once i was having a bad day, and a friend of mine was annoying me too much. I snapped and said some words to him and pushed him... made him cry, and shocked myself. at that point, i realized I had become a bully, that i hated. That was the beginning of my break in martial arts, because I needed to be at peace with myself because I didn't like what I was becoming.
About that time my younger brother was starting junior high, and I was nearly finishing high school, and I told him to let me know if people pick on him, because he is a target, skinny asian like myself, but more difficult for him was he has juvenile arthritis and other problems that people don't usually understand. During that time, he never told me that he got beat up, pushed around, picked on, etc. nearly every day. It was a living hell for him, not just that he was constantly sick, but that everyone picked on him and he felt so alone...
When he was nearly graduated from high school and I had finished college, his friend came over for the first time, and acted strangely when he disturbed. I didn't understand why. but my brother told me that all his friends, and most his class is terrified of me because they knew my temper and that i really could beat them severely. I felt saddened when hearing that because it reminded me of how I acted in high school. Bullies can regret their actions too...
My brother never told me that he was getting picked on, because he knew I'd go to his school, and beat the **** out of those kids who picked on him, which would land me in a lot of trouble, like possibly not graduating high school, or after turning 18 even going to jail. so he endured getting picked on and not saying anything because he didn't want any trouble to me. But by his not saying, it gave free reign to those bullies because they knew they could pick on him and he wouldn't tell anyone... but because that time had passed, and because I had changed a bit, so he told me what he went through in junior and senior high. it was so heart breaking.
So sometimes kids have reasons they are bullied, but in any way, they should still tell someone to get help. And sometimes kids don't realize they became a bully...
Bullies don't realize that when they bully others, that others hate them and want to get back at them some how. In my case, they couldn't directly take revenge on me, but when they found my brother was easy pickings, many people picked on him more.
One thing of note too, although in high school most of my schoolmates and I got along and most people think of me as a nice guy, there are those who got bullied by me who think otherwise. So i think many bullies in school aren't perceived as bullies by every one, so it is not easy to recognize who is a bully, because even the supposedly quiet ones may at one time or another bully a different kid...
Growing up was painful in different ways, but I think it is up to the individual, if one is seeking change, whether he was a bully or got bullied, there's a way to grow from those things. Those things shape who we are and how we perceive things. Hopefully one has the will to learn from the past and change their life for the better rather than allow the painful memories to ruin their future.