I was really going to be someone by the age of 23. Honey, the only thing you have to be by the age of 23 is yourself

When you are young, your potential is infinite. You might do anything, really. 

You might be Einstein. You might be DiMaggio. 

Then you get to an age where what you might be gives way to what you have been.

You weren't Einstein. You weren't anything. 

That's a bad moment.