More than 50% of the world population gamble in one sport or the other and some are making good money while some are still hoping and praying for their luck to shine.
Where did you get this 50% number or is it entirely made up? Would be nice to have a reference or a source when you make such claims. I don't believe that figure is true, it will be high but I likely to be that high. Also, what are you defining as gambling? Someone who is playing every day or just somebody that might have bought one lottery ticket in the last year? If you want to make a career out of it you need to find a form of gambling where you can gain an edge long term - if you have the intelligence, patience and skill. It's not an easy task because there are people who scrape a profit consistently off the fish at every level. You're probably going to lose short/medium term and have to constantly reevaluate yourself to close down your weaknesses.