Ideally, I don't think there should be female pastors.
As a woman, I used to be very angry and against this and asked God countless times why. He gave me the same countless answer. Later, it just made sense. It wasn't because God was sexist. If He was, then he shouldn't have made Eve at all. It was because Eve was Adam's helper and partner, but also the mother of all things.
As men were made for other great plans of God, so are women. When we come together, we become one and carry out the same plan that God has with our hands.
Deborah the prophet/judge was an exception. People came to her for God's wisdom and understanding, not the other way around. God chose her specifically for good reasons. She knew her limits and was humble. God blessed her with the position of being the judge, yet she served her people with humility. God picked Deborah because of her willingness to follow Him, not because she was a woman or because she had the ambition to exalt herself.
It also depends on the time period. Deborah lived in an era where there was war and the Israel needed guidance. Perhaps in God's eyes, Deborah was the one who could be used to carry out His plans because of her willingness and obedience.
However, I think it's okay to have a female Bible teacher at the school. It's school, after all, not the church. Also, as a child of God, you are the one who needs spiritual nourishment at this point.