Years ago, I was a postdoc at Johns Hopkins. When I was leaving there to start my tenure-track position here at Big State U, the chair of the dept at Hopkins, one Jeremy Berg (aka Datahound), dropped by to say goodbye. Something he said to me has stuck with me all these years.
You have not been trained to do what you are about to do.
He was absolutely right.
Despite the ubiquitous hand-wringing about academia only training PhDs and postdocs to be future faculty, truth is, we don't even get that right.
We're not trained to teach. Or manage people. Or manage a lab budget. Or serve on committees. Many are not trained to write grants. Or devise and run a research program. Program, not project.
The tenure-track years are all about on-the-job training.
The sooner you embrace the fact that you don't really know what you're doing, and neither does anyone else on the TT, the sooner you can work to fix that.