Didn't read anything the slightest bit offensive
Even swinging a rope or making a throwing motion is something that must be learned, before we where taught how to speak our entire view of the world was made up from what could perceive through our 5 senses. Remember before we learned language our thought process was not verbal, it was something else. Everything we saw, smelled, touched, tasted and heard was absorbed into our memory. Some memories gave us the "Don't touch that, eat that, look at that" feeling, of course not as a verbal command but as a "Gut feel" as an aversion. Others good sensual experiences gave us the "seek out" response, "get more of that" feeling or cravings.
To this day no matter how old the person is the largest % of our daily learning is via this sensory feedback loop. Now bringing golf instruction in to the equation gives us a mixture of verbal instruction and physical instructions leading to sensory feedback. But the golf swing needs to be split into various levels of competence before we continue.
Basic Level = The ability to swing the club and hit the ball
Intermediate = The ability to send the ball in the approximate direction.
Competent = The ability to take the skills to a course and play a round of golf
Advanced = The ability to score well and play close to scratch consistently
Extraordinary = The touring Pro's
The view that golf instruction does not work needs to be put into context with the level of skill that is trying to be achieved. Basic, Intermediate and Competent can all be taught. If the Golfer is lucky enough to find a teacher who's system, matches both their physical capabilities and is communicated in a way that's suits their learning style. Then this golfer will attain the higher levels, other factors need also to be present. The individual's commitment, drive and most importantly the correct circumstances/opportunity. The latter being different for everyone, some people need adversity and struggle others need the whole shebang and comfort.
Everything you have done in the last 2 years is not a waste, you may not have gained the skills you where looking for, but you have learned what DOES NOT work. Learning is not just a matter of finding what works, but it's also about discounting what doesn't. The common phrase of "It took me ten years to become an overnight success" is very apt. The calculation's made on the amount of practice needed for an individual to obtain very high skill levels is 10,000 hours of good / positive practice. If you took a 2 hour training session from the average Joe down at the driving range, there may only be 10 minutes out of that 2 hour session that is of real value. So Average Joe only has another 9,999.9 hours of practice to go.
Now that your looking to develop your swing under your own "Natural" guise, this is the time where you have actually taken responsibility for your golf swing. Taking lessons from a pro or reading various methodologies is handing off responsibility to the teacher and asking them to show you how it's done. In my experience pupils are almost asking for some kind of guaranteed download, like I'm just going to perform some Vulcan Mind Meld and viola the next PGA superstar is on his way. Teaching is meant to be passing down experience to a willing learner, but in Golf it has turned into proving your methodology is sound and works. SITD itself is a brave step forward as teacher's can be held accountable in front of a mass audience for their success or failure, many Pro's just put the PGA certified sign out the front of the shop and rest on their laurels.
The reason I have written my last few post's is not to belittle what you are doing but rather to help you understand that what you are doing is what most other golfers have done in the past and will continue to do in the future. They have not been fortunate enough to find/understand a methodology that is a close enough match to how they need to swing the club. So they start again and begin to work on themselves, they experiment with the best motions for themselves. They learn which body parts to concentrate on to find the best result, they either settle for a level of competence that suits their needs or they continue on trying to achieve the ultimate.
Taking this approach was how I finally got over a sticking point and turned my own game around, interestingly enough it took me around in a full circle. When I "taught myself" and found my swing, I could then understand the finer points of what the books and instructors where trying to get across previously.
Your just at the beginning of a very long road, but at the end you will find a swing that is truly functional and personal to yourself. It will never be anyone else's, it will take some time, Chipping away at 10,000 hours of quality practice requires tenacity and patience, but it will come. It's not our verbal reasoning which needs to understand, but our old sensory feedback loop. It's plods along slowly but once it's got the idea it doesn't forget.
With all that said I think it's my turn to whish you good luck, last piece of advice is to stop digging. You reached the bottom and not found gold, but you noticed that at the bottom of the hole is some good quality bedrock. Start laying courses of bricks on this bedrock and build your swing upon it.