That is actually what I ever experienced, losing more, and gaining less in gambling. That is why I quit gambling. Because until now, I am still confused about how to be in the gambling well. I tried to learn about the strategy of betting and the game that I participated in. But I fact, I still lost more. I feel so dumb 
Making money in gambling is not as easy as it might seem at first glance. In sports betting, this is possible, but it will take a lot of your time. It will also take a lot of your nerves, you must understand this. And before you find your working strategy, you will lose a little money, so your strategies need to be tested at small rates. This is all very difficult, so if you can't make money over time, then just play for fun, and bet only the amount of money that you do not pity losing.