Life is cruel for sure, but in your situation, at least it gave you a chance to learn what you did to the fellow student. Being pushed around, banned from community and being constantly insulted in the childhood make people believe they're really ugly, stupid and should feel bad. You gave him a great chance for him to end up like you're ended up now.
You would have more friends if you've worked on it instead of trying to hide your lack of social skills with ashaming others...
Just think about it, your in high school and your still a teen growing up. You just learn alot now its never good to be mean to people. But what can you do? Forgive them. If you hold a grudge for a long time it hurts alot more then feeling sorry for yourself.
And hey, Ive gotten my fair share of bullying throughout my younger years. All I could think of is boys are super dumb, and tried my best to think they were ok. They would put on this big smile on their faces, and when ever I retaliated, all it did was it made them laugh more. But it was soo hard. They were acting like boys that never understands a girls feelings. The most embarassing story was in high school that a guy broke an expensive pencil, ($5). I was crying through class, and I couldn't tell my teacher. Then my teacher tried to ask me something and he kind of joke about it. He didn't realize I was crying and the whole class laughed. That was really embarassing.
You would think that was the end of the story, well I don't rember, other then getting paid back for the pencil $5. But emotional scarrs can't truely heal, only relieve.
But one amazing thing is in high school, a guy who bullied me throughout high school, forgave me. I mean, that is the more powerful thing then complaining don't you think. Complaining get you no where, but forgiving and talking to the person that hate you or you hate, that is some courage dude.
Take it from Frank Peritti's example. It took him 40 years to really buck up and figure out how to treat his wounds for bullying. He writes about his experience in the wounded spirit. And he has a whole seminar how bullying on the other end affect others: [link]
But look at him, he is still working as a best selling author.
Sure this on the other end, but the result is the same. You take a bad risk when you treat someone horribly. You never know one day what will happen the next.
I've been thinking about why you used the title 'Life is Cruel' To me it shows that you still have not learnt your lesson. Stop thinking of yourself and look around at all the other 'cruelty' in life. Most of it can be prevented. Be now, one of those who can make a difference.
I beleive in this saying called "What comes around goes around."
Long story short, everything in life balances itself out. You are a prime example. Yin and Yang, good and bad. You can bet that any time you hurt someone, it'll come back and bite you in the ass.
I dislike your usage of "Life is cruel". Yeah? Did you expect that it'd be happiness, sunshine, and sex all around? The sooner you get adjusted to the fact that life sucks, people suck, karma's a bitch, the sooner you'll be able to go out and survive in the world.