As a high school teacher, you can be nurturing towards a student but don’t have room for research (unless, by some miracle, you worked as a RA during the summer).
I have no doubt that, if you made it to a college-level professorship (and, even in engineering, that’s a big if), you will be a nurturing professor, but part of a professor’s job, especially a tenure-track one, is to do research. At least you understand that life as a graduate student is stressful and, for any of them to succeed, they need to keep stress levels at a manageable level, and I think you would become one of those professors that would genuinely care about their well-being. After all, most of the time, an unhappy student is a student that is less productive, which, in turn, will hurt you and your funding prospects.
Sounds like high school teaching may be more suited for you (despite the ridiculous amount of disciplining you will have to do)…