Nail in the coffin'

Dude! Please stop! Bite me to the root and you'll miss me growing back again. What's up with you? Can't you get it over some other way? How useful is it to just bite me and toss me off? Let me grow and I'll show you of what great uses I am capable of! Was I not just a nail providing for myself and I'd back you up, truth is I'm just for survival and I'm clearly not succeeding. You are pretty aware you must hold your own back before you hold others' so you're looking in the wrong place. Nonetheless I stand my ground, I could show you wonderful deeds if you just set me free, just the same as now, here, wherever, just not whenever, It's getting late, growing stronger gets tougher as you keep leaving me this biting marks, scars' euphemism. You see, I understand the main problem does not lie in the act of you biting me but neither does the solution and I've heard you could be pretty rational, or so you claim to be. Just imagine, playing strings without a pick, efficiently scratching your back, easily picking a coin off the floor, minor quests you could get done much easier if you just let me grow. Look at me, I'm just a metaphor to what you are, to what you don't have to be. Despite all this, still,  you keep me alive.