Gambling basically depends on luck, so when you have 99% assurances due to further studies and experience concerning a prediction, I won't refer to that as gambling. For example, when I have done my research in cryptocurrency and seen the possibility it has to dominate the future and invest into Bitcoin, that's not gambling although if another users blindly follows my choices without carrying out some due diligence then that's gambling since he's totally depending on the outcome of my decision.

Gambling isn't a bad hobby especially when you don't abuse it, the society have made gamblers feel like losers to the extent they hide and aren't open about their passion or occupation. In my understanding if money isn't involves or you're not risking anything valuable for that decision you're making then it's not gambling therefore most of our  childhood decision shouldn't count as a gamble.