How to win a fight you cant walk away from?

Hi, I live in a quiet area....I use to anyway...Recently a huge amount of chavs have come out of no where and they are all looking for a fight...I am sure it will be my turn soon to get beaten up just because I exist....How can I prepair myself....The fights are unfair....Normally it's 5 vs 1 with these kind of guys...Weapons are involved.....And yeah....You cant say...."I dont want to fight you"..They will still beat the living **** out of you...How can I prepair? I only have weight and a nice forest to run around.....How can I prepair myself?