Is this type of thinking is right ?

actually whenever I do some type of competitions like in games or other activities , i think that if will be confidence that i am going to win because at the time my head keep on saying me "you have got the attitude , you are overconfidence , you will not win" !! but when i will think that i am not gonna win , praying God to show sympathy to me and when i loose my all confidence , i will win , is that thinking is right ? yes/no , why ?