I'm a special education teacher. I felt a calling to work with children with autism and followed my passion.
teacher (also called a school teacher or, in some contexts, an educator) is a person who helps others to acquire knowledge, competences 
Yes, I work with students who have difficulties in adjusting to their world. It is very rewarding.
the role of teacher may be taken on by anyone
Do you have any teachers in your family?
or college. 
Some other professions may involve a significant amount of teaching (e.g. youth worker, pastor).
In most countries, "formal" teaching of students is usually carried out by paid professional teachers. This article focuses on those who are "employed", as their main role, to teach others in a "formal" education context, such as at a school or other place of "initial" formal education or training.
Duties and functions.
A teacher's role may vary among cultures
Teacher
A teacher (also called a school teacher or, in some contexts, an educator) is a person who helps students to acquire knowledge, competence or virtue.
"Informally" the role of teacher may be taken on by anyone (e.g. when showing a colleague how to perform a specific task). 
In some countries, teaching young people of school age may be carried out in an informal setting, such as within the family (homeschooling), rather than in a formal setting such as a school