So many times i met pple including myself feel lousy sometimes when we "try too hard". It can be out of a good heart and motivation and doing a good thing. But if that thing you do is not really YOU or beyond YOU, you might sometimes get fearful, feeling lousy and a hunger for assurance that can never be filled. But i sincerely believe that you don't need to be more than yourself. What you are lacked with, God will provide. I find myself most happy and fulfilled when i'm just myself. of coz many things i ought to be better but if it's beyond be or pretending to be someone else. i find myself miserable. So i truly believe, be nothing more than yourself. Give your best and actually it's more than enough if it's your ground to take :)