Seems to me that that’s likely a self-fulfilling prophecy, which I subjectively estimate is at least as likely to prevent you from doing better as an actual biological problem. Maybe try to think of more ways to get better at it—perhaps some different kind of exercises—and do your best at those, before drawing any conclusions about your fundamental limits… because those conclusions themselves will limit you even more.
Seems to me that that’s likely a self-fulfilling prophecy, which I subjectively estimate is at least as likely to prevent you from doing better as an actual biological problem. Maybe try to think of more ways to get better at it—perhaps some different kind of exercises—and do your best at those, before drawing any conclusions about your fundamental limits… because those conclusions themselves will limit you even more.