Proper translation of the word "confidence" What would be the proper way of translating 


  I don't have confidence in myself to dance on stage.


I understand that this isn't a translation service, but my difficulty arises from the many translations of the word "confidence".

I've narrowed it down to 信心 and 自信。I also believe the sentence structure will be slightly different depending on how which I select. May someone please provide an appropriate translation?
The main difference between the two is that the subject of 自信 is fixed - self. That is, "self-confidence" is a more direct translation of 自信. If you can fit "self-confidence" in your English sentence, you can fit 自信 in your Chinese sentence the same way.