Here is a Business Insider link on how much NFL Players are paid. http://www.businessinsider.com/charts-expose-how-badly-nfl-players-get-paid-2013-9
The bottom line is that they are the worst paid players among the four major professional sports in the US. Players from age 22-27 are paid the lowest amount at $1.9Million per year compared to NBA, MLB, and NHL players who are paid $5.15M, 3.2M, and 2.4M respectively.
Lastly, NFL Players incur the most injuries of any sports profession which is not good.
It's always good to have a plan B, which is a college degree if you plan to play football. This way your education will support you and your family not matter what. Education is something that no one can take away from.
Always believe in yourself and best of luck!