My brain doesn't work

Nothing is possible. Living inside my own brain is a hell that I wouldn't wish upon my worst enemies. Why. Why do I find it impossible to do the most simple of tasks? Why can't I just sit down and do something without my mind just going blank, or getting overwhelmed? Why do my emotions flip in an instant, without any rhyme or reason? Sometimes dozens of times a day. Why can't I talk to people? Why is it so difficult to chat with someone without hating myself for wasting their time? Why can't I take these things slow? Why do I become obsessed with someone the day after meeting them? Why do I find it so hard to just chat with them like a normal person? Why?