Just one more vote to say I don't wear makeup. I think the last time I wore any serious makepup was for my wedding, over three years ago. (And it turned out to be over 90 degrees that day, so, what do you know, the makeup quickly disappeared.)
For job interviews, I might use some powder, lip gloss, blush, and some basic brown eyeshadow. Again, the last time I did that was over a year ago.
I also must admit I have acne. (When oh when will this go away?) But there's no point in trying to cover it up, since that just leads to more acne. And I also hate it when someone has a big blob of coverup on their acne. That just makes it stand out more. (And I, for one, can never seem to find the right shade, so I would definitely get the polka-dot effect.)
I agree with others that it's more important for you to just be yourself than it is for you to paint your face. When I have makeup on, I feel so incredibly weird, like I have to keep my guard up so I won't end up with giant smears of face paint where I don't want them. Feeling that restricted can't possibly add to my 'inner beauty' - I certainly won't smile as much, or feel comfortable. And what's the point of trying to 'beautify' your face if you present such an uncomfortable self? -Well, that's just me, anyway.
Next time your out in public, imagine you were a photographer tryint to capture 'natural beauty' in women's faces. Take a good look at people. You will probably find, as I often do, that the people that look prettiest are the ones who don't have obvious makeup on. (They might have some on - you obviously aren't going to get so close as to be able to check that out - but I think the 'naked' face look is so much prettier than the "I've-just-put-six-pounds-of-cosmetics-on-my-face" look.)
I am not against makeup per se - some people need to wear it for their jobs, etc. But I certainly think we can be just as pretty without putting it on.