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 
Try to learn not from experience alone, go and step back and watch how others perform. Find a niche game that you will enjoy and you know that you can win more than lose, most games are in favor of the house so find one that favors the least and try to concentrate on that one, learn the do's and dont's. Do not feel disheartened that you lose, if you know that you are having fun and that it does not affect you financially then do it again. Back to learning from others, some of what you should watch out for is their body language if psychological warfare is involved, sports betting on the other is far much more easier, try to analyze the teams that you wish to bet on, the good performers will be your best bet although they are the least profiting, and last is that you should only bet on the sports you love because it is far much easier to bet on that more than anything.