I have very very (naturally) dark lips, and I HATE IT

I really don’t know what to tell you, it’s hard to cover up natural lip pigmentation.  Dark or bright lips usually mean that you’re healthy and hydrated, and really aren’t a bad thing, and there are lots of people who would kill to have lips like that - but to each her own :)  The best thing you could do would be to layer concealer on your lips first, and then apply a nude lipstick over top.  Of course if you frequently lick your lips or drink, then even that’s going to wear off throughout the day!  You’re just going to have to be careful, or embrace your lips.. or you know, dehydrate yourself severely, although I don’t really recommend that haha.  I’m sorry I couldn’t be of more help :/