I've been teaching for nearly 20 years and at my present school for 12. I'm tired, but then so is DH, who is not a teacher.
I love most of the job. If I moan, it's mostly just to DH, and is always about management (very specific issues at school)
It's emotionally exhausting in a way that working in a shop is not. Last Friday, for example, the mother of one of my students died very suddenly. On Monday, he came in to school for an hour to see me. It's heartbreaking. He's 6th form so torn between being a man and being a child who just wants his mum. His friends are devastated. This afternoon, after a full day of teaching and a school show rehearsal (unpaid, in my own time, but so SO worth the effort for the 70 kids involved) I stayed and chatted to the 6th formers about how things were, about when the funeral is, about whether it would be OK for them to go, about what you wear to a funeral when you've never been to one before.
It's a wonderful job, but it is exhausting in lots of ways.
As are lots of other jobs
But don't bash teachers. I am very touched that this boy wanted to come in and talk to me on Monday, that he felt that he needed my support, that he trusts me to that extent and that I can help his friends to come to terms with this.
I'm leaving teaching at the end of this year though.