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 
You don't have to confuse about that because gambling is for making money, and if you try hard, you will not get better results. I suggest you play gambling without thinking about win and lose. Just try to enjoy the game and spend your time but remember to limit your time to make you spend more money.
Gambling will need the luck to win, and even if you use so many strategies and don't have luck, I am afraid that you will not win the games. As long as you don't spend too much money and limit your time, you will not lose too much money. That can prevent you become addicted to gambling in the long term.