I took a college level 'Intro to Teaching' course once. It paired us up with a teacher for the semester in whatever grade we choose to learn more about it and then there were assignments for the college to go with it. It was a real eye-opener as I explored this as an option at one point. I wonder if where you are there is a class like this you could take to explore this option. Is there an education dept or teaching certificate program at your school or one nearby that this might be an option; one that puts you in the classroom so you can see first hand all of the requirements and in's and out's of it.

Or if you know of any teachers that you might be able to job shadow with. Permission is required of the school first and may or may not be obtainable, but something to consider as well as a possibility. Sometimes the college career centers can help arrange shadowing for you as well.