The entire stanza :

"But all the time my insecurities
were trapped between the lines on every page.
If you read them back with hindsight
they become clearer than the printed font.
Hidden amidst the colourful background
was the darkness of my heart. "

this simply makes the piece, it's wonderful. the emotions you displayed here of having this wonderful, colorful story that hid a much darker, sadder meaning is great. keep up the good work!