This has a lot to do with your obsession about your witty, charismatic brother being better than you. Your threads have this theme over and over.

Not everyone is witty and charismatic. What strengths do you have? What does impress people about you? What do you enjoy doing? Whose company do you really enjoy? You may not even really like these people you hang out with.

I urge you to stop comparing yourself to your brother. Everyone is different. You have to be the best YOU.