Polonel said:
Well... There's so many martial arts classes available in my city, I'll do some researchs before signing. If you have some suggestions, that would be great !
Any Karate or Gung-Fu school should be OK IMO. You might want to tell the instructor why your there and what happened to you and I'm sure that he'll have specific advice for you on how to deal with and prevent these kind of situations from happening. Maybe try to find a dojo where you might eventually do some sparring so that your body gets the feel of dealing with an aggressive opponent attacking you (actually it's only an approximation to that since its much more intense in a real street situation where the adrenaline is pumping) but its still good training for the body so that your body intelligence learns to 'understand' these kinds of situations and gets the feel of it all.
When you become somewhat proficient in the training then your body will become more sensitive to the kind of bums that jumped you the other day. It's like if there is a situation forming around you that's potentially threatening then your body might start to pick up on it because of the training (like an antennae) even though your everyday 'conscious' mind is not aware of anything unusual. Kinda like a warning system. Then your conscious mind might start to suddenly notice things because its more connected to the body because of your training. Your attention, even though it might be occupied with something, may suddenly for no reason shift it's focus in this direction or that direction because your body may be telling you something and now your a little more sensitive and responsive to this communication. This doesn't mean that there is necessarily anything threatening around you but if there is then your chances of picking up on it will have increased. Your training can be a lota fun too!