Whether you're a guy or girl, you may have found yourself standing in the never-ending Sephora perfume aisle sniffing many, many, MANY strips of paper (or your arm) until you get dizzy and eventually have to make a beeline for the exit.
Choosing perfume or cologne is very personal. Here is an article with some great tips on how to find your signature scent:
http://nymag.com/thecut/2014/12/guide-to-finding-your-signature-scent.html