Confidence in your plays

Been trying to be more confident in my aim but the more i deathmatch the less confident i get, its not that i dont get the kills its just every so often you will be shooting someone clearly on the head practicing your tapping etc or chest and nothing will reg.

How do people stay confident in there own abilities knowing this stuff happens? It's been happening a lot lately for me

Best example i have was 1v1 the dude started reloading backed into goose so i just stood still and tapped his head while he reloaded... nothing happens not a single hit, how could you possibly stay confident after that

It's a bit of a moan post but also curious if people do actually lose confidence knowing the game could fuck them no matter how on point there aim is