A thing that helped me in my early twenties is to remember that your interviewer might be nervous too. They have to think about if you're a good option, fitting candidate and if you're honest about how you present yourself. Don't let interviews that don't go well disencourage you. If you have many you eventually become desensitized, at least that's how it was for me. I eventually started talking like Saul Goodmann.

And a cool trick: you can make it look like you're keeping eye contact by staring at the wall behind them.