Pain,
I only have three things to say, I understand your attitude I'm from the so called "wrong side" of town myself. So I have been through some nasty **** in my day, I've also seen sunny down town Bagdad (yes I know I misspelled it

).
1- You wanna teach these young punks on the street a lesson, I understand your point on this. I've even shown a few pups whats its like with the "old dogs" but there a point to testing yourself and teaching others. If wonna teach the pups then lead by example and if you want to test yourself get in a ring, cage, backyard whatever you are less likely to get jumped by 4 to 8 people, get stabbed or shot.
2- I just have to ask why do feel the need to test yourself? I'm not gonna tell you your being stupid, but on allot of levels you are. Now I'm gonna point this out to you, we both know everytime you fight you take a chance, a serious chance, if you have no "safety net" you are looking at serious pain and possible trouble.
3- You enjoy the excitement of it, that are two things which this generally can relate, either your just now getting a taste of the excitement and have started craving it, or you have lived rather dangerously before and now you are having to feel the void so to speak. I've seen this third option with guys who went to Iraq and after living in constant edge were having trouble taking that edge off. I seriously hope this isn't the case because you are on the way to a mental breakdown at some level.
As far as anything else goes, I say have fun. Allot of people won't learn until they get hurt and most will never learn. Do as you do brother, but be safe or as safe as possible doing it...