I've been passively suicidal since I was about 9, that got a whole lot worse at 11. By 14, I was researching it intermittently and by 16 had a number of attempts. Even when I've been quite good that feeling that I will die soon never goes. I find that even when I'm happy, and it suddenly is there it is nagging away at me, the level of shock I feel every time just adds to the problem as surely I should expect it by now.
I definitely get both though. Now (at this precise moment in time) I wouldn't consider myself that suicidal, I know I'm ok, but it still crosses my mind a few times a day, as a passing thought. When it was severe recently, I was under 24 hour watch, not being left to go to the toilet with out someone with me for a week, by the end of which I was hospitalised for a further week. For me it is a seperate entity that attacks regardless of how I feel -if I'm good, I can kind of rationalise it out, but if I feel bad too, then I have no ammunition to fight it off with and I don't care about keeping it at bay, I don't want to be in a rubber room, I want to be dead. I want that now. I don't want an attempt, I want success and like a metal filing to a magnet I'm drawn and nothing will really stop it. Until I'm sedated and medicated enough for it to pass.
For me the quiet voice is the loud voice, but it's just further away. To ignore either is the wrong choice but is usually the easiest. If I ignore it, it gets louder to spite me and starts acting out against me. To keep my self from escalating I have to maintain a perfect balance of isolation and social activity, and between doing absolutely nothing and just enough to be occupied - this for me is usually being in my room most of the day alone, doing practically nothing except maybe some light reading or internet browsing and sleeping a lot but still going downstairs to eat with my sister. It sounds dull, but it's all I can do, anymore and it gets worse, any less and it gets worse. I'm sorry to hear you are struggling with this, good luck for now and keep posting when you can.