Yes, not something I'm proud of though. To get into detail, my first fight was with a boy and I was 13.
He said something about me, didn't care, then he said something about my family and I flipped. All I remember is me slamming his head repeatedly in the air conditioning. (I lived in an apartment at that time so the units were right outside between the complex.)
He apologized at school a few weeks after and tried to be friends with me but I wasn't having it. I do remember me getting an ego boost because it was all people were talking about at school for weeks and because he apologized only because he didn't want it to happen again.
After that fight, every day during recess all the boys and girls practiced fighting with each other in preparation for a possible fight. We fought every day for like 3 weeks . It finally stopped when one of my friends pretended she had a cousin in a gang and threatened to have them all shot. 
That's when someone called a parent and then the principal wouldn't allow us to go into the park after school anymore. The class unity during those years was real though. 
I wouldn't say I lost though.
