(Formal) The best way to cheer yourself up is to try to cheer somebody else up. I don't think so. For me, the best way to cheer myself is to believe in myself and assume everything is going to be to be all right, even if I don't have any confidential thoughts. I always try to do that and that really worked. In the middle of an examination, I had slept 30 minutes and ruined science part, but I tried to believe the next subject would be perfect. Consequently, the overall score of that examination was not too bad, since I tried to believe in myself.

Which one is more natural and commonly used? A: I was sad to have lost a piano competition. B:I was sad to lose in piano contest. 1, "to lose" or "to have lost" 2, "lose in -" or "lose -" 3, "a piano competition" or "piano contest" These three are my main questions, please answer them. Also, if exists, please point out any other mistakes.