Intersection problems

I ride my children to school every day, along suburban streets. On the way back, I have to pass another school. There is an intersection where I turn left onto my street, and a lot of oncoming traffic is turning left into the school. I can easily signal, and move to the left of the lane in order to turn. The street is quite wide, and traffic behind me can go around me on the right. The oncoming traffic is a problem. Most drivers almost seem like they don't know what to do. A lot of them wave me on, but the cars are so big that I can't see if someone is coming around them on their right. This happened recently- someone, probably angry at having to wait in a line of traffic turning left, zoomed around going straight. I would have been pegged if I'd gone when the left turning driver waved at me. So, I sit and wait until I can see around all the cars, or until there are less cars. In the meantime, people are gesticulating at me because I won't go, sometimes quite angrily. They won't go either, which holds up the traffic more behind them.

I could get off and walk my bike, but there's the same problem of cars zooming around the left turners. My husband, a veteran urban biker says I should just do that, though. I've emailed the school to tell them to educate their parents, but I'm only one bike. Am I correct in turning this way? Will the parents ever get it and treat me like another vehicle?