At age 15, if Michael Phelps told you he'd earn 22 Olympic medals by the time he was 27, you'd say he was "unrealistic." Every great accomplishment is unrealistic until it happens. The difference between the people who who attain those types of goals and people who never will - their definition of that word!
The 1% believe you can achieve absolutely anything. 99% only believe when evidence proves they should. Who are you?