As a young child my mother tells me I wanted to be an English literature teacher. I probably wanted to inspire others to be bookworms like myself, and be able to have heated and deep discussions over what we read.
I've been through a number of other fields of work, but teaching was my passion. Having taught all ages (from 6 year olds to my oldest student at 96), I think I prefer teaching adults - young children require much more energy and an entertaining approach, and I am more analytical.
It's certainly not an easy profession. Most people only consider the class contact time when they think about teachers. They don't think about the time needed outside the classroom - to design a class, prepare the materials, think about how to encourage *all* students to learn the material, assess work, provide feedback, develop their own skills, assess new textbooks, plan curriculums, provide support for other teachers, and much more.
Plust teachers must be able to multi-task within the classroom - teach, assess, encourage, control, watch over all students, and try to guess what their facial expressions (or lack of) really mean.