There is many gr8 replies on this topic tho if you fell like protecting yourself involves self-defence then here is a tip ever watch the new movie of karate kid the part were he has to put hes t-shirt on an off on and off x1000000000 hehe well big guys used to push me around i tried to used that method and it worked (not like on the movies lol) but if they wont stop the make your mesg clear!! good luck.