The limits of your own mind are different than the limits in the real world. However, the limits of your mind prevent you from doing stuff that is actually possible, making them impossible by default.
The real answer for everything is: I don’t know.
If you think you know, you’re in trouble.
If you think you know, and what you know is that you “can’t”, you just materialized that.
Say, if you go to the gym for six months, do the proper diet, do salsa and acting classes, break your comfort zone, host parties and make new friends, go spend time overseas, and by the end of it if you didn’t experience any transformation, then you “know”, or you almost know.
Knowing that you can’t without trying is just a defense to protect your current comfort zone.
So, it’s not really a “cant”, but a want. You don’t want. That’s OK. But it’s not about what’s possible, but about what you’re willing to give up in exchange.
Talking you out of it won’t work. Even forcing you do to the actions won’t work since you would sabotage the process.
But if life forced you, by burning your house, burning your country, burning your life, and you had to survive by changing, you would do it.
The excuses are a waste of time.
You want to dance? You can. You want to become more extroverted? You can. You want to play tennis? You can.
Can you be as good as Roger Federer, as charismatic as George Clooney, as successful as Bill Gates? You’ll find the limits there. Because you’re comparing against other people, you’re entering a competition.
You can do a lot of stuff. It doesn’t mean you will “win” nor that you’ll be ‘as good as’.
Though, chances are you’re using the ‘as good as’ as the excuse for not doing. The two are unrelated. Say, you don’t need to be ‘as good as’ the French master chef in order to have a restaurant. You don’t need to be George Clooney to have charisma. You don’t need to be Roger Federer to play tennis and win tennis matches. Not one of these guys are preventing you to learn and have your own quota of success.
The not doing is.