I think if it's causing serious stress at the moment, then it's the right decision. I think that inside, you still really want to teach and that you won't give up on this. I hope not anyway.
Don't let the attitude of the students (I assume they were in their late teens/early 20s) put you off. They usually aren't old enough to commit to much yet. Good luck, you'll get better with experience. And remember there are people out there waiting for you.
Simon
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