Can we still say we are gambling if the event is something we are at least 90% sure that we are going to win?
Yeah even at 0.1% or 99% wining or not you are still gambling. Though even at 90% chance you can still lose.
Gambling isn't just about the chances of winning, it's about risking something of value on an uncertain outcome. That 10% chance of losing still means you're taking a risk. And the danger is, as you said, overconfidence can make you risk more than you should, thinking you're in control. Even the bestlooking bets can go sideways. That's why true professionals always manage risk no matter how "
certain" something feels. Cause that chance can flop too anytime.