Your personality will remain the same...as long as you allow it to. Or, perhaps your personality will struggle with age or sour with age if you ignore it. Only with conscious thought and effort will your personality improve.
Henry Ford said something like, "If you think you can or you think you can't, you are right."
His logic applies to personality.
"If you think you can change your personality or you think you can't change your personality, you are right."
So what do you choose to think?
And, do you intend to share your thoughts with others?
If so, which thought [the can thought or the can't thought] will provide them the most value?
And, which thought will provide you the most value?
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If you are pleased with your personality, you are standing on solid ground.
If others are pleased by your personality, you are standing on higher ground.