If the probability of losing is high and the probability of winning extremely small, then statistically a beginner like me is more likely to fail than to make a good profit. Can I quit this? 
Moreover, there are no role models in the face of millions of winning players who, if they exist, prefer not to advertise it because of taxes.
We do not know the probability of losing. We only know that the probability is about 50:50 before you play gambling and once you play, the probability of winning can reduce, especially if you do not win any. You can quit gambling anytime you want and we do not force you to play gambling all day long because you will get the risk and lose your money. Before you lose too much money, it is better to quit the games and leave the casinos to prevent big losses. Moreover, there are no role models in the face of millions of winning players who, if they exist, prefer not to advertise it because of taxes.