It is rather amazing how little incidents can change once way of thinking. As I grew up, I had always heard the word diversity, wondering what it really meant. I asked my mum what it meant and she told me it meant strength in differences. I was perplexed; how could people with different behaviors, Ideologies, principles and cultures work together successfully. It did not make sense to me but I thought to myself why care? Diversity as a concept never crossed my mind until an incident occurred in my penultimate year at high school.
^All of this quite frankly, can go. It is quite unlikely that as you were four years old, to seven years old, you kept hearing the word diversity. Also, the lack of established time frame completely weakens your introduction. When did you think that etc? Just remove all of this...
*Your second paragraph is in need of serious grammar revision if you want it to be truly effective.
We were different but stronger and all that came to my mind was the day I asked my mum what diversity meant. I had seen what it really meant.
Yea, you can remove that as well. Also, this paragraph needs grammar revision as well.
Your conclusion is weak and ineffective. Revise it.