doubts have purpose but too much of them causes us to never move out of our place... spending too much time thinking about our problems does have an influence on our mood and if we become habitual about focusing on all thats wrong, we can easily allow ourselves to become overwhelmed... take some time each day, even if only a few minutes, and appreciate something which is completely out of your own control.. let yourself be mystified at its beauty and shape, form and existence.. its there, always been there, and maybe its been overlooked...