Bragging is a choice that gets people rooting for your next mistake.

Talking yourself up asks the people listening to confirm something about you, and most of them quietly decline. Worse, it sets a level you now have to keep clearing, and the moment you fall short there is an audience already waiting. Confidence and announcing are not the same thing. The second one mostly recruits witnesses for your next failure.

Let the result be the first thing people hear about, and let somebody else be the one who mentions it. If you want to talk about something you did, say what you learned rather than what you won. Notice how differently a room treats the quieter version.