I don't know the mech eng business, but I'm a different kind of engineer, so I'd guess there's some similarity in terms of career options. So I'll throw one option out there as it's my long term goal. If you think your job is interesting or enjoyable at least some of the time, for some projects or some typical stages of most projects or whatever, there's a medium between jumping ship or joining the soul-crushing path of working as many hours as possible to make as much money as possible at a job you don't have such a deep passion for that you actually want to spend all your time doing it and being stressed about it.
If your dream is really to be a golf teacher, then sure, do the research and go for it if you think the end result is something you'll love and there's a solid chance you could get there, then go for it. But if you just absolutely love playing golf, and there are aspects of your current field you enjoy, then you can also dedicate all your research and effort and make your life and career choices to create the life and lifestyle you want within the field you've trained for and are good at already.
One example. I had an acquaintance who worked as a research programmer. Already not a super high-stress job, but definitely full time with crunch time stretches where he was spending way more hours than he really wanted to at work and whatnot. Eventually he left the regular job, became a genomics research programmer consultant, worked his way up to making $75/hr, and moved to Italy where he could live super cheap, work 10-20 hrs/week, and devote almost all his time to his dream of becoming a sculptor.