He made it clear to me before I had kids that a public school was not an option for my children. I had highschool teachers (I graduated from a school with 50 other students, not a big, bad school) who knew I would not put my kids through the system.
I believe you. However, please consider that just because YOU have received a mandate from God does not mean that others have received the same marching orders.
And, just food for thought, what would you do if you realized God wanted you to teach in the public school system for the purpose of reaching out to others?