I want a relationship with my cousin
Do you think that a relationship with your cousin could have negative consequences?
I want a relationship with my cousin and I will stick with it regardless of the potential cons that may come afterwards.
Close genetic relatives run the risk of having offspring that have a reduced chance of surviving, not to mention some serious social stigma. There are plenty of other people out there to have a relationship with that aren't related to you.
Nothing ventured nothing gained. I would just like to be with my cousin.
Unfortunately, that's just not okay.  The risk whatever children you might have, and the social costs to being in that relationship, will make you more miserable than any pleasure you get from it, I promise!  Try and find someone else!