I was and I regret it, but I personally am always trying to improve. If it helps I think one reason why people bully is because we are irrational at heart. One girl that was super mean to me in college probably equated me to a negligent father. Seriously, who would be mean to someone on their first day in college and asking someone what the professor said constitutes as being hit on? Looking back I should have called her out but I was too blue pilled at the time. I honestly forgive her and even if I had a chance to hurt her I wouldn't.
Obviously there are other factors such as upbringing (a former coworker that stole from me never knew his father), genetics, ability to manage stress, and the advent of online communication. I even think the feminization of men have made some of us gossiping backstabbers.
At the current moment I don't bully people out of malice but I can come across as a prick. I have a resting bitch face, dress well, work out, and don't tend to explain myself so people project to explain my behavior.
The flip side is you can't always play nice in this world. My current boss is such a b word and while I can't engage her directly, as she's the type that will fight back, I fight back when she isn't around. But even if I leave my job (which will happen soon) I wouldn't get revenge in the future as I've done my part to hit her back. She's the type who can't deal with stress well so use your imagination on what tactics I'm using on her to piss her off
If anything being a bully and getting bullied has helped me survive in the real world.
Let'e end this on a positive note, bullying sucks and being young I've made mistakes. However, it has taught me a fair amount and I'm always improving. Don't bully people for fun but do stand up for yourself.