The correct spelling of the word is "driving." This is the gerund of the verb "drive." Even though the infinitive has an "-e" at the end, this changes when we use the gerund form. This is similar to other verbs such as "give-giving," "wave-waving" and "love-loving."
"With a bald spot in the middle of my hair—" and "They will say: “How his hair is growing thin!”
Explanation:
The lines that indicate that the speaker is concerned about what others think of him are: "With a bald spot in the middle of my hair—" and "They will say: “How his hair is growing thin!”