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.
One of the worst things you can do to yourself is to make yourself believe that you can make gambling a source of income. Gambling is not a source, it is at most a drain of income.
So think of gambling as purely for entertainment and make a budget with win/lose limits, which if reached, you stop gambling (at least for the day).
The math behind gambling will now allow you to make it a reliable source of income.