My dDad's sSecret

Title capitalization rules

When I was in primary school, I always thought my father's hair can'touldn't go grey since, I haven'td never seen him go to a barber shop nor drye his hair at our home.

Since you are describing the time period (when I was in school), you don't need the "always." However, you might have alternatively written, "I always thought... but when I was in primary school..."

It wouldn't beSo it's no surprisinge that when my teacher taught us greying ofabout hair starting to go grey when you reach 50 years old, I shouted, "You're such a liar!

This is leading in from your previous sentence, making "so" a natural add-on.

nNot even a single hair on my dad's head is grey!“ Everyone looked at me like I'm was an idoiot.

Speaking about yourself in the past => I was

I feeledlt/was embarrassinged, but still believed what I said.

There is no "feeled," only "felt" for past tense of feel. However, it's more natural to use "was" here

That evening when my dad picked me up at thefrom school, I immediately asked him, "Dad, you haven't been dyeding your hair, haven't you?

yYour hairs are is natural?"

We speak about our head of hair with the singular "hair"

DMy dad turned his head and speak withoke confidently, "Son, where doid you this'sget that from?

"Where do you this's from?" does not make sense, but here is an alternative. "Where did you get that from" is a way to ask "where did you get that idea"

Of course, I dyed my hair.

"Who would want other to see his oldto look at other people's grey hairs?"

We generally don't refer to grey hair as "old hair," but "old grey hair" would work if you do want to include the word

Since tThat's when, I learned that Tteachers can be right sometimes.

"Since then" would proceed a habit; something that is continuously occurring. But speaking about one point in time, better to use "when"