My mother considered gambling as playing with money. She sternly reminded us not to gamble. When I was in college,
Your mother did not want you to get addicted to gambling while in college, that is the reason why, perhaps she did a great job by advising you to face your studies , because you might be carried away by the money being made from gambling while in college
One of the reasons also why government itself restrict the age limit so that under 18 people who do not have much maturity at times stay away from gambling and that is the purpose of having age restriction. Also I think if in religious it is fine and government does allow to play legally it is fine to play and win amount as well.