you can t just walk into a foster home. you have to actually be in an abusive or dangerous situation, not just some brat trying to run away from home. once it is determined that a minor is in a dangerous situation, they are assigned a social worker. then they are placed in a group home. they will stay in this orphanage-esque place anywhere from a few days to years until they can be placed with a foster family or it is determined that it is safe for them to live with their family again. foster care is not fun and i can bet you that almost every minor who is in foster care right now wishes they had a stable home life and were able to live with their parents.
They don t take walk-ins.