How to deal with teen gangs?

My city is full with fun groups gangs and etc.I can't go to the shopping mall with my friends I can't get a girl because of teen group.I remember last time i went to the shopping mall with my friends we were attacked by 25~30 teens.They had baseball bats,knifes and don't know what else.We didn't provoke or something else just passing by.Tell me good advice and tips.I cannot fight 30 people so don't recommend me maritial arts,kick box and etc.I can't carry a gun or knife because that's ilegal.Sorry for my bad english.Thanks!!