Can i become a professional sportsman?

ok i am 17 , i play tennis everyday i am preety good and get really good results , its just i used to play rugby and i was extremely good at that because of my speed i am really fast , i feel i was much better at rugby and have a lot more chance of making it to a professional level , at the moment i stopped footy to do full time tennis and train everyday to see how i would go i get solid results but i dont beleive i can make it anywhere , i have all the abilitys to be a pro footy player , i think i should stop tennis soon and just work on my footy , and train hard at it , would it be possible for me to make it pro at that ? what would use do in my situation , i need your help thankyou!