undercover street fighter

Im the girl that sits in the back of the class room that every ones bullies but doesn't really know who they are. Im quiet and I have a photographic memory. If you haven't guessed I am a nerd. My name is Jasmine but I usually get called freak or nerd. Im a senior and Im 17.
But I am also known as Shadow.Most people fear that name and they should since Im a street fighter and I am able to fight.
I have a little brother who is 4 who i take care of by my self his name is Theo. It has just been the two of us since what happened to the two of us last year when he wasn't even four yet. But that story is for another time since I lost many people that I love that night and I didn't want to loose Theo since none of our family would take us in. So I took Theo my self and have been raising him my self since my family did have kind of a lot of money and it was mine along with the house. But just to get us by for a little. So we still need money.
It was all going perfect till the new guy came to town. He messed everything up that I didn't want to have changed.