I'm attracted to my cousin
What has made you realize that you are attracted to your cousin?
Well, there is nobody else I am attracted to.
I understand your feelings and it may be that you just haven't met the right person yet. It is bad to have incest relations, but maybe what you have is just a crush because you are around each other so much.
I'm going to have sex with my cousin.
This is not really a good idea. You should keep from having sex with members of your family as it can be dangerous to reproduce.