Take up Krav Maga.
There's not masses of punching or kicking, but it's awfully nice to know that if anyone in the world tries to attack you or mug you, with any weapon, that they'll be dead before they know what happened.
I had a month like that last month, as far as I was concerned I might as well be dead, but then I realised I'm funking (that's right, funking, we don't need to swear here cause we're ace) awesome. Chin up, we were all born winners.