We should be determined to live for something. May I suggest that it be creating joy for others, sharing what we have for the betterment of personkind, bringing hope to the lost and love to the lonely.
Yes, you can--if you do everything as if it were the last thing you were doing in your life, and stop being aimless, stop letting your emotions override what your mind tells you, stop being hypocritical, self-centered, irritable.
We must have a theme, a goal, a purpose in our lives. If you don't know where you're aiming, you don't have a goal. My goal is to live my life in such a way that when I die, someone can say, she cared.