My brain doesn't stop

Between work, family, relationships, and a social life. I find myself constantly dragging myself down. I over analyze every word I say and every move I make. I hate that about myself but I cannot stop. I question if I am good enough, if I am smart enough, funny enough. it puts me in this dark place in my mind and I get sucked into it for days and it ruins the close relationships that I have with people because I come across as distant or cold. But I just don't know how to open up to them and be able to be "normal."