Put me out of my misery...

[MadCityRef]

AP,
9 techs in 37 games is not good. When I first started out I had similar numbers. Perhaps it's nerves, or the hyper-alertness felt when doing something new. It goes away. Relax.
The more you work, the more opportunities you'll have to deal with coaches and players. You will develop the skills needed to talk and diffuse situations.
Your vet refs were talking at you in a poor attempt to give you advice. But it was advice for your benefit. Yes, I was told I brought attention to myself on the floor.
Your techs tonight seem justified as you describe them, although I probably would have tried to talk the coach back to his bench first.

The assignor-coach conversation went like this: "He's young, he's new, he'll learn. Don't worry, I'll talk to him." And then the coach fibbed. Happens.

Seek out some other vets for game management pointers. The first tip: Don't react immediately; take a breath.

37 games is nothing to base a career on. You don't even know what you're doing yet.