If you are playing gambling games, you will most likely be at a loss if you check the overall wins and losses of all your gambling sessions because the results are completely luck-based and one can't win if they aren't lucky.
However, in sports betting, one might be able to earn some money if they know what they are doing and have enough knowledge and experience about the sports they are going to bet in.
Making money from gambling is a complex activity, but unlike roulette, where almost everything is decided by luck, in sports betting you can independently decide on which outcome you want to bet on and the probability of winning is higher (especially if you bet on an event no more than with two outcomes). But to make money in gambling you need to have discipline, nerves of steel, the ability to manage finances and analyze events. For the vast majority of players, this is too difficult a task.