Most do. The simple reality is that pretty is "above average looks," and you can't have the majority or even half be "above average." So for the majority of women, they would need to wear makeup to look pretty. Although for many wearing makeup might not be enough - if you're just flat out ugly, makeup may help, but it won't make you pretty.
That said, naturally pretty women don't need to wear makeup to be pretty - although they may still benefit from makeup (go from pretty to beautiful, for instance). Also, the primary purpose of most forms of makeup is to cover your deficiencies - if you have naturally long eyelashes, you don't need makeup that makes your eyelashes look longer.
I know a girl who looks STUNNING without makeup. I don't think she even needs to wear it at all. One time though when I asked her to hang out with me at night she put on some makeup and I mean it didn't make her ugly, but it didn't really help her either.
For me it's not so much about being pretty as it is looking interesting. I look OK without makeup, but I look very plain and simple. I use makeup like an accessory to make either my lips or eyes stand out, and I think it makes me look more interesting.
I prefer going natural ( I have a pretty face,) because it's easier on the skin (no rubbing when taking it off, pores can breathe,) and I think it makes you look more confident.
When I do wear make-up every now and then, I use it to compliment my features and add some vibrancy to my face.
It really doesn't make you pretty; a girl with an average attractive face, still looks average in attraction with make-up on. Girls who cake the make-up on, look like they have confidence issues and are uncomfortable in their own skin.
So I say, if make-up isn't your thing, then that's totally okay. Just because all your friends wear it doesn't mean you should to.
you should at least try it,like I can go out without makeup,and I look ok,but when I put on makeup,i feel much more confident and putting on makeup is fun,it's like painting,you create the look that matches your personality/mood