Try to relax when you have the ball.
Exactly, it comes naturally for some people, even at a young age, but for others (including me when I was younger), it's always either about shooting the ball right away or trying to get rid of it with passes that will often be risky. Try to get more comfortable with the ball, you don't have to be a PG to actually create something offensively for your team. If there's not much that can be done, don't start dribbling just for the heck of it.
If you tend to play with the same people, you'll start learning from your mistakes very fast, because you'll learn to anticipate what each one of them may do, and that will allow you to avoid bad passes and have a better court vision overall.
But all in all, I think trying to be more comfortable with the ball without wanting to get rid of it right away is the best tip in your situation.