There are many ways to gain confidence in life. Especially as adults. Yes, we have a lot of stuff going on; work, money, family, bills, maintenance of cars, etc.
But if you want to get better and gain confidence in your passion, desire(s), hobbies, life, etc, you will have to DO stuff to move FORWARD.
Yes, let’s move forward.
Practice, engage your brain, make it happen. I use my own methods of gaining confidence by practicing as much as possibly; daily! You can to if you do not already. Good luck in your endeavors.