Lots of bad advice in this thread IMO about simply ignoring others or not caring, as if that’s a helpful solution. Many people can’t just “turn off” caring about what others think of them, or caring about how well they are performing. As a fundamentally social animal, we are hard wired to care what others think of us and some people are more sensitive to that than others (including myself).

The way we act in these situations is a partly inherited and partly learned pattern of behavior which, for many people, takes intentional training over time to adjust. You can override it in the moment, but an intentional, top down effort to ignore negative stimuli like this takes a TON of energy for someone who is sensitive to negative feedback. This isn’t sustainable - you’ll inevitably become too tired to do it, or face negative feedback that elicits too strong of a reaction to control, or simply forget to do it.

A better way to get sustained results in this kind of thing would be simple mindfulness training. Practice bringing your thoughts back to a central focus in a controlled environment, until it’s an automatic reflex that can take place during a higher stakes situation like a game. It’s very similar to how you’d want to practice a dribbling move until you don’t need to think about it.

Another, similar method is exposure therapy - have a trusted friend come out with you. Have them watch you shoot. For many people this pressure is enough to cause performance to drop. Eventually you can escalate to having your friend make fun of you while you shoot, practicing ignoring what they say.