Most Helpful Girl
The problem is that you seemed far too easy at a point where her brain hadn't made the connection that she liked you too. As a beautiful girl, she has probably had her fair share of men telling her she's beautiful and hitting on her. You were too impressed by her beauty and she could tell you wanted it too much. With girls there is a kinda double standard, if we find the guy physically attractive right off the bat, his "approval" based on looks is a compliment and makes us like them more but with guys who we don't find physically attractive right off the bat, its almost creepy and makes you less attractive. The key is to impress her with your personality, hide your feelings for her for a little bIt and show how attractive, confident and funny your personality is. After this point, make sure she's hooked to you - looks gorward to your messages and texts and withdraw. At this stage in the game if you've done it right she will want you.
What is also very important is to make sure you reach her threshold of attractiveness, once you clear that basic level your fine. Make sure your haircut is attractive, work out at the gym to avoid being super skinny or chubby and yeah :) also avoid giving a ton of compliments, keep her guessing, play it cool.
I had two unattractive guys in my life. One who I could not get off my mind and one whose texts I used to dread because I'd get em all the damn time. One played it cool, was te life of the party and slow to make a move and left me guessing. One was too much, too soon, too many compliments. Who got my attention?