In addition to the other mental-health maintenance suggestions, you'll get confidence back once career things start to go right, but it may take a little while. I would suggest doing some practice-interviews before you do real ones (or practice-customers for entrepreneurship), so that you can work the hiccups out of the way without missing out on anything. "Fake it 'til you make it" is a real thing, especially in the US, and so are positive-feedback loops. It's a lot easier to work on other parts of life once income is sorted out.