Acting is the ability to live truthfully under the given imaginary circumstances
That's very different, picking up the impulse instead of picking up the cue.
Acting can be fun. Don't let it get around.
Your acting will not be good until it is only yours. That's true of music, acting, anything creative. You work until finally nobody is acting like you.
Listen with your gut, not your head.
Act before you think - your instincts are more honest than your thoughts.