Clarification on marriage with cousin

I luv a girl two years younger than me.. we did not mean to fall for eachother when we started our conversations but it has been since 3 yrs and we eventually ended up getting mad on each other.. now we can never ever live without one another.. The problem is that she is my father's brother's wife's sister's daughter.. Ending up as my cousin.. she figures to be my second circle sister which i personally cannot accept.. she is related to me on her maternal side.. I really want to know if there is any legal issues bothering our marriage??If so then how could I get it resolved?? Please help me in resolving this problem..