Be yourself. Because there are really only three types of people that you will encounter:
those who will never approve of you no matter what you do
those who will accept you with conditions
those who accept you unconditionally
So if you're beating your brains out trying to impress people, STOP. It won't matter! Be yourself. Be constantly improving yourself for YOU. It will effect other people but it won't change their perception of you. They've likely already made their assumptions.
What kind of person will you be? What kind of person will you surround yourself with?