I totally fell into teaching Flat - I was a pub landlady & rock gig promoter, then looked for a change in career as a young widow, & dusted off my degree in order to do a PGCE.
As it happens, I love teaching (& I'm good at it). Being a teacher in the UK atm, however, sucks. I've done it for 15 years & the conditions & working culture are simply worsening.
There's always been a high attrition rate in the early years of teacher careers - this is now increasing. Some of it has always been down to the factors you describe, but it used to be a winnowing process of those who weren't cut out for it.
Most of my younger colleagues now, however, will openly tell you that they see teaching as a 'starter' job; hard work but yes, good holidays, & it looks good on a mortgage application if you're a 20 something. They intend to do other, easier jobs once they're ready to settle down & start families.
The difference is that now we're starting to also lose those of us who are 10 or more years in, love teaching, & had genuinely envisaged it as a career until retirement.
My dc's school just got slated by Ofsted, largely because there's literally not an over 30 in the building except the Head - it's 23yo NQTs as far as the eye can see. Lovely, talented young teachers, but no-one is mentoring them properly & the body of experience that was there 6 years ago when my eldest started no longer exists.