jeeze, I relate to whatever it is you described 110%. I don't know how old you are, but I'm 29 and kind of used to all you mentioned. I became aware of it around my twenties or even earlier. I believe certain people -and even certain (herd) animals- have a heightened awareness, that serves a purpose (imho). It's a bit confusing cause it resembles social anxiety and it deviates from the social norm.
On life being pointless : i'm in it for the occasional extasy, and only then and there, I know it's all worth it.