Depression and bipolar DOES make it hard for us to believe in ourselves, to believe good things can happen... but they ca, they do and they will.
I also understand that it's hard to not listen to the bad thoughts... NOONE is expecting you to switch off to them and that will be that, it takes time... and through that time, we're here to listen and to offer a shoulder and hugs (and no feeling guilty missus 'cause you deserve it...)