The following sentences might indicate that the speaker is worried about what other people think:
1) They will comment on how "with a bald patch in the centre of my hair—" and "How his hair is growing thin!"
2) The words "with...thin" most likely indicate that the speaker worries about what other people think of him since he considers what others would say about his thin hair.
3) Because of the others, rather than his own thoughts, he is more concerned about the "bald spot" on his head.
This supports the assertion that the way others see him may have an effect on him.
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