How can I Look Good for a Reunion?

It's not really a reunion, I think. I'm just meeting some old schoolmates from my junior high. I'm in my eleventh year now. Honestly, I've been bullied very badly all the way from my elementary years to my junior high. I never had any real friends, and I was at the bottom of the ladder, where everyone thought that they could do anything to me and get away with it. The fact that even according to the teachers my year has the most violent students made the situation even worse.

Then during my three years in junior high, everything got worse than before. The bullying was worsened especially by this girl who have failed class three times before, immediately standing on top and creating troubles everywhere, I was beaten up, had some students ordered to pretend to be my friends only to spy on me and betray me later on, locked into the toilet and had water poured all over me. The taunting, the shunning got worse too. Like in elementary school, I got lonely and tried to make the teachers my friends at school , which made them hate me even more. But then things changed when I was in my 9th and final year at that school. One of the teachers was close to my worst bullies, and she IS famous all over the school for bullying students, so she often targeted me. It was horrible, more so when she made all the other teachers who used to be my only companion at that place hate me. I felt surprised and betrayed. I did stand up both to her and the leader-girl. And I'm very proud of that.

I changed school when I graduated from there. And I'm a lot happier now. The road isn't always smooth, but I'm a lot better than before. The nine year I spent there changed me. From the chatty and confident kid I used to be when I was small into this paranoid, shy person I am now. But I'm recovering.

But you see, around next month I might see some of my schoolmates from that hellish junior high. And I want to let them see that I'm a lot better; that I'm happy and pretty and they all should feel ashamed and regret having brought that hell onto me.

I want to look amazing in front of the people who had thrown me into a living hell, some kind of my own little revenge, so to speak.

I need help. Can you give me some tips?