Should I break up with my girlfriend before Stampede?

Male, Single, 19: I am currently in a relationship and it’s going well.  We’re young, having fun and I like hanging out with her., you know, regular mushy shit… BUT I am 19, Stampede is almost here and I want to be single.  No attachments and tear it up during Stampede.  

Basically I am thinking of breaking up with my girlfriend before Stampede. There may be a chance we get together after but who knows.  I am sounding like a total douche but I feel like I might regret this.  Should I do it?  What is the best way to break up with her?