When I place a bet, I keep 100% confidence in that.
If you dont have that, dont place the bet at all. You might be losing that bet, but your confidence should always be 100% and not anything less.
Having confidence and getting the correct outcome is a different thing. You might be confident but you might still lose. Nothing wrong in that, not every bet is predictable. However dont boast about it, keep it inside your head.
People are free about their confidence score even if it is 100% but keep in mind the chances of winning in sports betting are 50/50, for example, if you choose smaller odds, you tend to win more if you are consistent with small odds, you can win more even though there are always favorite teams that lose.
I still have my own confidence even though the score expectation is higher, for example 70% and that's even after making an analysis of the match before the bet is made, about the results that lose maybe it's unlucky, so I won't be selfish about this.