This is just a sign of the future. I'm not a teacher, but in my industry it is a LOT more stressful now than 20 years ago. My DCs will never have the life my parents had - not even I do. They had little stress, dad had 9 to 5 working hours, mum was SAHM. Still earned enough to have the nice things in life though.
In future, there will also be a lot more people with a lot less jobs. This kind of competition will mean that everyone has to be able to deal with stress and give 100% at work. So if you get stressed now, I don't know how you'll cope in future. I know not everyone can handle this - but that's where the future is going unless people decide to have less kids. Amazing how some people put their noses up, when I say that China is probably the future (problem there: too many people!). And yet, these very same people often don't agree that maybe it is better to just have 2 rather than 5 kids.
So whatever job you have, however stressful it may be now, all I can say is you need to build up resilience. Things will only get harder...