What to do what to do....?

I am in a tough spot here... I was having a very bad day yesterday and I was stressed beyond my limits and I was walking out of the gym and the girl I like's best friends were being really really annoying like making faces, laughing at me, etc.. I just turned around and flipped them off! I didn't regret it until I thought about what might happen.. I want to say sorry to her and her friends and explain why I did it but I don't want to sound all sappy and stuff.. It was a long story because at the beginning of the day I found out that she had found out I liked her.. Then she had told half of the school.. In an hour I was being harred endlessly and I couldn't get away, even the frickin YARD DUTY knew about it! I was stressed with work and I couldn't get a moment's peace so I was just mad by the end of the day and that's when it happened.. I did the deed and I don't feel good about it. I think this will affect my chances of going out with her since that was my plan for yesterday.