Serpenteye
I've studied various forms of martial arts for the past 20 years, and I've been in quite a few real-life fights. I want to echo what a few have said: traditional martial arts training will get your butt kicked in a street fight. My best friend (who has 23 years of experience) and I have taken all of the pretty flying kicks, katas and plain old stuff-that-doesn't-work and eliminated them. We concentrate our hybrid style on pure, realistic self-defense. It is somewhat sad that there aren't many schools/instructors out there that take this approach. If you can find one that concentrates on pure self-defense - learn from him. You wanted some self-defense advice, so here you go:
1. Since guns are illegal where you live, carry a knife. Knives are GREAT weapons and are actually deadlier than guns when used properly. They're also a tool, and it's pretty easy to just say, "How do you expect me to open a box without one?" if you are questioned about it. There are quite a few knife fighting videos and books out there that are good, if you can't find someone to teach you. Knives are easy to conceal too and that makes them even more dangerous.
2. Carry a Mag-Light flashlight, preferrably the 3 C cell or 3 D cell models. These are made of aircraft aluminum and can easily crush a skull on a critical hit.

Seriously though, they're great weapons and if asked about it, "I use it when's it's dark. Duh."
3. Develop a limp, and carry a cane. Canes can even be taken on airplanes with no problems whatsoever. There are actually fighting canes you can buy online. My friend has one and they are great, not to mention you can quite easily learn to fight with one by reading a book on it. The damage you can do with 3 feet of hickory is amazing. If asked about needing the cane, "I need it from time to time for an old [insert sport here] injury. Today my [insert right or left] knee was killing me." Let them prove you wrong.
4. Pepper spray not only works on the mucous membranes of the eyes and nose area, but any membraneous body locations - like armpits and genitals. O-u-c-h. Spray to the face, spray the genitals, kick them in said genitals, run away, laugh hysterically. Pepper spray is NOT a weapon, it is a "non-lethal defensive measure." MACE has killed people (if you're worried about that) but pepper spray never has, it's all natural. Make sure to get one that has at least 10% oleo-resin caspium.
5. Remember that you carry any weapon to protect you or those you care about. If anyone has a problem with that - too bad. The folks who are anti-weapon are also not going to come to your assistance should 5 scumbags attack you. YOU have to defend YOURSELF. If needed, kill your opponent. If not needed, don't. It's as simple as that. You have to determine in that instance if you're going to be a victim or a victor, defensive or defenseless. I commend you on defending yourself against those scumbags, most people nowadays simply give-in. Good job. Also, remember the phrase, "I feared for my life officer, he said he was going to kill me."
If you have problems getting any of these things, or have questions - e-mail me and I'll help you however I can.