I need my ex back/ex rant

Yesterday was my 21st birthday and instead of being happy and drinking legally for the first time I felt lonely and empty. This was the first birthday I've had to endure alone since I broke up with my ex boyfriend... 
I want nothing more than to get back with him and up until the moment I randomly burst out crying I didn't 100% believe that that was what I truly wanted either. I don't know what to do or what to say to get him back.. and yes I've heard it all before. The whole he's your ex for a reason thing. Well, I don't believe that those reasons are good enough I don't believe they should have been reasons to end things and I just want to fix it. It's almost been 3 months and I'm still hung up on it so it has to mean something.