I had a fight with some woman in McDonalds since she has been harassing me since I was 16.
Has it been ongoing?
Yes, the whole thing started when i said I was 16
Adults should not harass children who are behaving well in public. You should bring this to the attention of the McDonald's as well as authorities.
Who knows what I should do?
It sounds like this person has anger and control issues that could escalate to something more serious. You definitely need to talk to an authority figure about the harassment, for your safety and others!