Attraction or attachment with my cousin? iin

I think of her all the time, I love being around her. She makes me so happy & not talking to her for a day feels like a week. I miss her if I don't see her often too. I get nervous & excited around her. I'm a female but still unsure of my sexuality. To me, she's beautiful & I love everything about her. I'm worried I'm getting or already am attached despite trying not to be. is it normal and how do I not become attached ? And yes I do have other friends but I always end up missing her or rather spending time with her...