If your good deeds frequently seem to go unappreciated, it doesn’t matter.  They are the right things to do.  This is what makes you a good person. 

Have you ever questioned why God could allow something bad to happen to someone good?  Or wondered why, as a good person, certain events which seem dire are happening to you?  Just focus on your purpose in life through your actions, and leave certain mysteries in life to God.  Answers will come later, or in the World to Come.