You may be proud of your achievements; you may have a very high opinion of yourself; you may thing that others should be made to realize what a fine fellow you are. But nobody will ever have a high opinion of you if you have too high an opinion of yourself, because a person who praises himself is never believed.
I admit I didn’t score any of the goals, but it was largely due to me that we won the game.
Self-praise is no recommendation.