What you say in this post brings to mind a Zeppelin song, In the Light, especially the first verse:

And if you feel that you can’t go on
And your will’s sinkin’ low
Just believe and you can’t go wrong
In the light you will find the road (You will find the road)

Basically, always believe in yourself, we are the strength and the solution to all our dilemmas!
It will probably be one of the songs I will talk about in my new column, "My idea of Song"