First thing's first, you've got the golf bug. Good! Next, you want to improve and know enough to ask for help. Also good.
As one that has been playing and working in the golf biz for over 30 years, I'll start by sharing this. There is no such thing as having the perfect game/swing/technique. Even the legends of professional golf, Tiger, Hogan, Nicklaus, etc.. would agree.
Rather, playing golf to the level one expects of themself, is part purposeful practice, mixed with positive thought and unwavering confidence.
Take a series of introductory lessons from a regarded teaching pro in your area. Watch the PGA Tour pros play on TV. Do some research about the greats of the past. Instead of tieing your brain in knots watching video after video, or reading countless magazine blurbs, compile your list of favorite professional players. If they've published an instructional book, read it. Again, don't follow the hype provided by the no-names your friend told you to watch on YouTube.
On an entirely different tangent, you're 29. Are you secure in your career? I switched my career path at 27, and took a job at a private golf course. With unlimited access to play, my game SKYROCKETED!
Historically: Ben Hogan, Arnold Palmer, Tiger Woods, Bobby Jones
Truthfully: Ben Hogan, Fred Couples, Reteif Goosen, Curtis Strange.
Fantastically: Ben Hogan, Fred Couples, Brooks Koepka, Payne Stewart
For the sake of referencing somewhere to start, Ill begin with reaffirming your belief that, playing mini tour golf is a tough way to make a living.
From my own experience I understand how you came to the conclusions of just how hard it is for anyone to achieve golf excellence.
Speaking from deeper depths of my experience, I can say that's where our common ground stops.
Playing golf at its highest level isn't strictly about talent. Not about hitting 350 yard drives while shooting 29 for 9 holes against friends. Playing golf.at its highest levels is about belief.
You mention the impossibility of a 22 year old with a 5 handicap ever doing anything with their game.
I was a 27 year old weekend golfer (I didn't even carry a legitimate handicap index) when I realized I hated sales jobs and landed a job at a private club, a club that offered no restrictions to the course if I wasn't on the clock. Not long after I discovered local mini tours. After a number of painful years donating my tournament entry fees to the purses, I started playing good enough to finish in the money. Not long after I was actually winning.
My point being, there are a number of threads here, those of which detail the dreams of chasing golf greatness. Stories that offer and speak to the side of success.