If you just wan to gamble for fun, you should never play online gambling, because online gambling is just a waste of time and money and there is no fun in online gambling. To enjoy gambling visit a regular casino and enjoy the whole night but never accede your gambling limits. Casinos are the permanent place for professional criminals.
It's possible to enjoy online poker or blackjack if you're playing with a live dealer and a table packed with other real people betting against one another. I'm not saying that if you do it you aren't in it for the money because you are but you can have some fun along the way. It's not like this is a job for you. Many people kill time playing cards online.