Look,your still young go out there and look for a girl that just like her if not then better. If she haven't called you back yet then that means she just need sometime to think. Once she see that you have stopped calling her she is going to wonder ,where have you been and what have you be doing.Just give sometime,but in the meantime go out and date just to keep your mind off of her things will pull together just give it sometime. I'm a 19 year old women and I know how it is to brokeup like that my boyfriend just gave me some space and once he stop calling i called him! HINT!