Do I really need 15 pairs of jeans

Why do I have 15 pairs of jeans? I 10 white shirts, 14 black sweaters and 50 pairs of shoes. My closest is super messy all the time. I have a friend who decided to simplify her life starting with her clothes After 3 years she is very happy. So now its time for me to do the same. How many pairs of jeans do I really need? For her its all about quality she may only have 3 pairs of jeans but they are expensive long lasting and very versitile. So I am looking through my closet starting with the white shirts hmmmm.... I have 5 long sleeve one is a V-neck long sleeve, one a thermal long sleeve, one with a round neck, one that is a little tighter, one that is super light material. 5 short sleeve one is a V-neck, one with a cute pocket, one very light material, one a tighter white shirt. I also have a more dressy white shirt. How do I decide which to keep or should I just start over get rid of them all. I feel like I need all of them. Its time for me to use the rule if you haven't worn it in a year you probably won't get rid of it. I will keep you posted on the outcome.