I promise at least some of these published authors are lying... or telling very good stories to themselves.
Yes, my characters shout at me, really, really loudly. What none of these podcasts told you is how painful that is! Ever try and teach a full day of lesson to 11-16 year old kids while there are two guys right in the forefront of your brain, fucking in the shower and swearing at each other every chance they get? (That was how I met Marty and Hrishi). Any of those authors give you an idea of how hard it is not to say something wholly inappropriate when that happens? and never mind the fact that when this happens, you basically have no choice in what you write - you're just along for the ride, typing furiously and wishing you could actually sleep.
Everyone's method is different. Your characters might be deeper or more thoughtful because they need prodding. Some move quicker than others, but everyone has the chance to get there. And yes, and Robert Rex said, we're all learning. Do not get Kitt, or anyone else, started on how appalling my grasp of grammatical concepts is sometimes.
Do your thing - you're the only one who can. Life is far too short to be anyone else.