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 
It's a very good thing that you stopped in time. The real fact is, no strategy exists that can always make you win in long run and that is why casinos make profit in the long run and you lose. If there was a strategy that would make you win, casinos would have banned using such strategies. Along with the fact that we are human beings with unlimited greed, we never stop till we lose it all
best is to stop rather than chasing losses as we will ened up losing more!