I'd just like to point out this to the OP:
Not sure if you smoke or not, but I always find a good piece of advice is to approach people or groups you're a bit wary of and ask if anyone has a light for your cigarette. You'll show them that you mean no ill towards them and that you're confident enough to approach them. (Please note though that this might cost you a cigarette of your own when they ask you for one back)
For everything else, listen to Yossarian. He lives.
Don't assume those 'chavs' hanging around are trouble. There's not a whole lot for youth to do here in the UK in general, so hanging around with mates on the street, listening to music and having a laugh is one of the only 'free' things to do. I've done it in my youth, you've probably done it, even your parents probably did it. But don't assume they're bad people. Don't avoid large groups, walk by them with confidence. You might get a joke thrown at you, but laugh it off. You might start to realise that the same group of people hang around that area quite regularly and you can rely on that group as a bit of safety if something else happens on your way home. You might even make a friend, you never know.Yosharian said:6) Try not to view all the chavs as a nuisance, but rather as loud youths with a chip on their shoulder. If you're friendly and show you can take a joke, 99 times out of 100 that would improve the situation rather than escalate it.
Not sure if you smoke or not, but I always find a good piece of advice is to approach people or groups you're a bit wary of and ask if anyone has a light for your cigarette. You'll show them that you mean no ill towards them and that you're confident enough to approach them. (Please note though that this might cost you a cigarette of your own when they ask you for one back)
For everything else, listen to Yossarian. He lives.