As fast as I read your question these two struggles and challenges came in my mind...
1. I have this challenge to not hurt anyone's feelings at all. Sometimes miserably i fail but i doing the best that i can everyday to develop myself to be better and better day by day. That might be even impossible but just doing my best.
2. I have this challenge to help others. I just wanna help as much as i can by any way possible. And when I can't, i get so disappointed of myself. So doing anything i can to be able to help as much as I can.