I feelk lk im going insane literally, am I? Plz help?

Ok I feel lk im goin insane I feel lk my brain is on autopilot, I think stuff out of the ordinary and I have horrible memory, if I do something the very next second ill feel lk it happened days ago even tho it just happened could this be from depression, im in a horrible state of mind and I feel lk my life is going on ahead with out me, I feel lk im in a fantasy world or as if I dont exsist and sometimes unbareable, a better example is when ur drunk u dnt know wats goin on but u do at the same time then u wake up tje next day n u think dam wat happend last nigh?? Thats how I feel dsily my memory is so vague even tho seconds just passed I am in a point in my life were im unhappy n often have anxiety attacks am I going insane, do I belong in a mental institute? Am I memtally unstable?? Plz help