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I was scared of dentists and the dark
I was scared of pretty girls and starting conversations
What at first appear to be common, insignificant childhood fears, if looked at more closely, can actually hint at the main reason for the problems he faces later in life. All of these fears point toward a similar theme: insecurity about himself. Dentists would point out the imperfections with his body; being in the dark would mean being left alone with just himself and the unknown; pretty girls would remind him of the "perfection" that he feels is more than what he deserves; starting conversations would induce the need to look good and not "mess up." Therefore, it is established that the singer does not feel good about himself, and seeks external things and people to lift him up.