ARE YOU AWARE:
there are only ~17,000 professional athletes in the United States and with a total census population of ~301,139,947.
thus you have a .0000565/1 chance of becoming a professional athlete.
WHAT THIS MEANS:
you have a .00565% chance of becoming a professional athlete. chances are you will not become one, you will not be paid anything for your sport, you will not even make the minors...so stop aiming for such high goals or comparing yourself to the NFL, MLB, NHL, NBA, etc. If you aim for such things you can pretty much only be crushed. Instead remember: it's about fun and your health.
I play water polo and there really is no professional league (at least in the USA, there is a good paying one in Europe but no one cares) thus players are playing in general just for the love of the sport. That's why I love water polo. Too many football players, etc. think they can make the NFL and don't realize there are only 32 teams.