Many new gamblers start with the same mentality that they want to gamble only for fun but if they like any of these games then they will start playing these games every day. Even though you spend small amount every day then over the time you will spend a lot of money on these which is not good if your earnings are not that high. That's why if you find some other activities to pass your time then it will be good. Gambling should be an occasional activity.
If they do, it is hard to say that gambling is not wrong , you might can do whatever you want , but think about how people around you react on it?
So if you feel fine , just gamble without have to feel guilty and recognize gambling as a normal thing not a wrong thing.