Why it's me Why it's you

I am very typical.I am Unique.I am just who is uncommon.I am difficult to understand.I am who simplify very difficult.I am always new.I am always ahead.I am Healthy.I am Strong.I am Average sized.I am Smile-faced.I am serious-face.I am Honest.I am Confident.I am Average humorous.I am Good for some one.I am Bad for some one.I am leader some where.I am Learner.I am Teacher.I am servant some times.I am Lover.I am Looser.I am winner.I am developer.I am manager. I am owner. I am wonderer. I am writer.I am reader.I am viewer. I am runner.I am brother.I am son.I am elder.I am younger.I am happy.I am very happy.