It is there when you look at pretty much any magazine cover.
Be this person, look like this "14 days to rock hard abs" - "15 minutes a day to a new, happier you"
So, it is perhaps hardly surprising the number of people struggling with issues of identity: who am I, really? What am I worth? Do I matter?
1 in 4 people will experience a mental health problem this year, and 1 in 6 of the people you meet today are currently doing so. (source: Mind)
Somewhere between 1.6 million and 4 million people in the UK are affected by eating disorders. (source: Anorexia & Bulimia Care UK)
Nearly a quarter (22%) of 14-year-old girls in the UK self-harm. (source: The Children's Society)
And those only scratch the surface.
What answers are there when we wrestle in the lonely hours of the night with those questions?
Dietrich Bonhoeffer, the German pastor imprisoned and killed by the Nazis, wrote of his struggles with those questions in a poem that ends:
"Who am I? They mock me, these lonely questions of mine. Whoever I am, Thou knowest, O God, I am thine!"
Who am I? Someone made by God to know Him, someone loved by God, someone held even in the darkest nights.
What difference would knowing that make to your life?