funnily enough make up doesnt add much 'prettyness' to a person, i think its very psychological.
it'll sound daunting to you now but try a few days without make up, just at home when you're chilling.. or when you go out shopping, and just look at how indifferent it is, it'll make you realise you probably are naturally alright looking without make up.
i hardly wear make up, the usual eyeliner and mascara if anything, otherwise i'm too unarsed.. but put it this way, its good for my skin (no makeup) and people do compliment it, i won't deny it.
theres more to a person than their looks.. yeah people always look at what you come across as first, but real people are discovered.