Yes, I find it frustrating that we don't have unlimited time and energy to do everything that we want. Sometimes this thought bothers me a lot because I have no answer to it and it makes me feel deflated that the only solution is to do less and prioritise.
                         
And I understand you and your friend very well. Though it might bother her sometimes, I think it's better to be around positive people than the naysayers, for me anyhow :).