“I am not good at that” is a language of victim.
If it is your choice to not be good at something, say “It have chosen not to invest my time learning it.”
If you intend to get better at something you are not good at, you can say “I am not good at that yet.”
“Yet” changes everything. It changes your posture towards the possibility that you can be great someday.
Using proactive language may make an impact on others, but more importantly, it changes the way you approach things.
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