As human beings we all need people to interact with. We are not no-man-lands standing in the middle of the ocean. However, happiness prospers best when we surround ourselves with like-minded people who have set similar goals for themselves and who are not threatened by our determination for success. Trying to change someone who does not have your mind frame is an exercise in futility. They may just be happy with what you perceive as mediocrity but to them it is enough success. Accept them the way they are or stay away from them. If you accept them the topic of change should be off-limits in your conversations. Let them be and be happy for them.