Entropy, I could be way off the mark here, but reading your posts it seems to me that you want to try make-up, but are lacking in self confidence to wear it, and you feel you would be compromising your own beliefs and letting yourself down if you did wear it, and also feel angry with yourself if you found that once you wore it, and did feel more confidant, you would be buying into what you see as something that society is forcing upon you.
Makeup does not have to go own like warpaint, inches thick, fake eyelashes, and reminiscent of a drag queen (a la the TOWIE lot and almost every other z lister in a magazine).
Make up can be part of your style (think Goths, Punks), or it can just be a light covering to brighten you up and stop you looking knackered and washed out.
Even men wear tinted moisturiser now!
If you havent worn it for years, that is how I would have a go, Benefit do an excellent tinted moisturiser that also has sun protection in it too. It just evens up your skin tone, and gives you a healthier look rather than a pale, in need of a good nights sleep look...
We all brush our hair to make us look a bit more presentable, so there is nothing at all wrong in putting on a bit of make up to do the same.