There is no such thing as "betting carelessly" in gambling. Any pattern you use has the same % as any other. Also confidence, skills and experience are meaningless, the only thing that matters is to be lucky enough to win. Gamble for fun only.
Sports betting is completely different and there are people that can consistently make money off that. Poker and sports betting are really the only things in gambling that has a lot of skill and knowledge involved.
There is only a handful of people profiting from sports betting though, 99.999% of people here are not, I can guarantee you that. I'm certainly talking about normal gambling, casinos/roulette/dice not sports or poker.