英語の勉強を始めたワケについて

会社の朝礼で3分間スピーチというものがあって、そこで英語でスピーチをしました。
こんな感じの内容を。

A few decades ago, I studied English in junior high school,high school and university.
But in those days, I don't like English lesson. I'm not good at English.
In 2006, I had tripped to the United States of America, Boston,
to participate in a computer technology conference hosted by Microsoft Corporation, so called Tech-Ed.
The conference sessions were all spoken in English, and the conference materials were all written in English.
Of course I understand computer software codes written in C# and Visual Basic.
But I barely understood the conference sessions and the conference handouts.
I had a culture shock and It's the time that I decided to study English.
There are many many materials about computer software in the world.
But those are almost of all written in English, about 90%.
I want to be one of the best computer software engineer in the world.
So, I need to learn English to make my dream come true.
That's why I am studying English.
From that time, I have been learning English for three years by myself.
And This is my first time to speech in English.
Finally, I introduce you a proverb.
"The more I learn, the more I realize I don't know.
The more I realize I don't know, the more I want to learn."
by Albert Einstein.
Thank you. thank you all for listening attentively.

初めて英語でスピーチをしたのでとても緊張しました....