I think that rather than changing your behavior to make her happy, you should behave as yourself. Tell me, what satisfaction you will derive from a relationship that is being acted out? will you be able to marry her and live happily? One day, she will know about your true personality and blame you for cheating her.
are you getting any jou in this acting? why are doing this for? What is your objective? If you be yourself and search some one who loves you for what you really are, that will give you real happiness. Nothing else will do that.