"Yes, but how do we know what is realistic until we push ourselves to the limit?"
I would say that life teaches us that and it started when we were kids. It also helps to have people in your life that are honest like a coach, friend or family member that are sharing things with you that aren't based on their own insecurities and are still willing to support you as you follow your dreams.
Remember gym class...when your teacher picked you to pick teams or you were standing in line waiting to be picked. Fact is...some kids are more gifted athletically than others...just as some kids are more gifted academically than others. It's usually quite obvious which ones are which after spending any amount of time with them.
Take American Idol for example...it cracks me that sooo many people really think they can sing and are so unrealitic about their abilities or capabilities.
I believe there is almost always room for improvement. I don't like to set people up for failure but at the same time I'll support them and guide them if they want to try and shoot for the stars...even if the odds are against them.
It's just at some point a person has to find out exactly what their gifts are and be realistic about the areas in their life they may not be so gifted in.
Ray