Keep dreaming. When those kids run your nerves to the ground because they don't want to learn, or when they totally and completely disrespect you, or when they have an attitude about everything, or when your pay is about half of what it should be, you'll understand how truly hard being a teacher is.
Now, if you can trudge through all of this and still manage to inspire a couple of children; wonderful, you have just done what about 80% of the educational system fails to do each and every day. Otherwise, be prepared for hell. You are going to have to know much more than the required subject matter, that is for damn sure.
Teachers in the US REALLY don't get paid enough for what they go through.