Japanese, Korean and Chinese arts will take time to
master.
Your best bet will be on something more practical. Muay Thai, BJJ,
etc.
And the best is not to fight, if there's a need to fight, run.
Saving your life is more important than fighting. If you can't run
away, make sure there is enough distance from them, pick up
something and start whacking. Never use kicks, you will die
there.