Gorn, you sound like an introvert who is trying to become an extrovert. That's tough. Wasn't there a study not long ago that showed that:
* introverts spend alot of energy being sociable and actually feel tired afterwards, and recharge from solitude
* extroverts recharge from being sociable and feel drained from solitude
Can this be overcome? The study didn't address that question.
To be extremely specific about it, I will (if this is successful to a substantial degree) be an introvert who has mastered his thoughts to an extent that I can successfully prospect, and perhaps do other things that require a sense of peace about particular aspects of self promotion.
I originally said I am kind of like Spock at war with his human and Vulcan halves.

But I don't think being an introvert is at odds with being functional when needed.
I'm about half extroverted. Example, I can't code any more because I can't deal with the endless hours of solitude.
But I can definitely function well around people generally for extended periods.
I do need lots of time to recharge, though.
So in my particular case that is what I am dealing with. YMMV.
Hey, I figure that ANY improvement is better than NO improvement. And I am working on core problems, not trying to find a coach to wave a magic wand over me.
As far as the study goes - this particular study focuses first on identifying the specific problem areas or behavioral or thought process issues.
I have done enough cold calling and certainly thought about it enough to have a really good profile of my particular issues.
I didn't want to give a report on the book right now, but here is one example of a quirk (one which I don't have): "Role rejection". You think that being a salesperson is slimy and low class so you avoid identifying with the role. And that directly affects being able to sell effectively.
There are 11 other pathologies, also. It's quite granular.
This particular text has a set of recommended therapies or exercises that deal with each of these issues. Some are behavior based, some are thought process based, some are word based.
This book heavily references I D Shukhov's favorite philosopher, Epictetus.
I believe that being an introvert who understands and deals with his own thought process and behaviors to the extent that self promotion is at least possible and readily doable places me at a significant strategic advantage. It's quite rare. In most of society the technology doers are the quiet people who have others do selling for them. And the sellers and marketers can't do anything.
I am stuck being a quiet person who knows his shit, so this is the best use of my effort at present, to branch out and master things that few others in my position do.