All took different lengths of time. I remember my first serious girl breaking up with me when I was 18, It rocked my world and I really felt like I wanted the world to swallow me up and I 'mourned' for about a year. Now I look back and laugh and thank my lucky stars she did break up with me cos she was a nutter.
And from one extreme to the other. My last girlfriend broke up with me about 6 weeks ago (we had only been dating for 3 months) and I can honestly say that I am over her already. She didn't deserve me and I knew it even when we were dating. I'm just too much of a chicken to do the breaking up!
I am sorry you are still hurting Brittany, but, as everyone on this board will tell you, it can and will get better/easier. Just remember, that which does not kill us makes us stronger. You will emerge from this a better person with more self-worth and higher self-esteem.