if you chose aikido as a tool for gaining quickly the ability to cope with street fights, you have done the worst step.
aikido's self defense amazing abilities can not be ignored but it has something much higher for you.
learn Krav Maga or any other real situation fighing method.
keep in mind the essense of the sentense
the purpose of the aikidoka is to win harmony
body and mind
with the surroundings
with the universe
when you achieve it you have gained he most important victory.
who will fight you then?
this is what i try to keep in mind whenever i can.