Here's some free advice that will actually change your life:
Do not "be yourself". Be who you WANT to be. What do I mean? From your approach with this girl to your posts about this subject here, it is obvious that you do not even know who "you" are yet. Which is ok and perfectly normal. Sometimes tho "fake it til you make it" can be powerful, as long as you choose a persona that doesn't lead you to be an arrogant asshole. LOL
Google Cary Grant/Archie Leech and see how he transformed his life from a cockney circus clown (yes) into one of the most sophisticated, charming and impressive leading men in Hollywood history.
Cheers!