Bullyed??? ????wtf? Help me?

hey sup! Im brandy im 13. I moved to a new school. Ofcoarce im getn laughed at bc my big gap in my teeth. I dont let them see it. Umm well we all was in 3rd hr. This one girl is soo mean. so bad made the teacher cry. Reson why is she knows they cant wope her.i desided to be the idiot. She started pickn on my best friend her bro just died and she told her," theres always something wronge with her" she lien' i said no she aint she got in my face said..this has nothn to do with u..so shut the **** up..i made the mistake of sayn make me. She pounched me in the face. I got up everyone is laughing i said ok ok wow nice move for someone one cant hit. She swonge i came up and punched her kicked her got on her back held her hands down and made her kiss the ground..did i do the right thing? I mean everyone is thx me but i mean i could have told an adult? Idk help