Debate Team that I built from scratch

Please briefly elaborate on one of your extracurricular activities or work experiences that was particularly meaningful to you. (About 150 words)
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In my junior year, I established Debate Team and became the first chairman.

I found it hard to build a winning team from scratch. When I looked for a debate coach in the beginning of junior year, I couldn't find any, while none of teachers in my school had capacity in debate. We self-coached.

In our first tournament, we didn't even make it through the qualification round despite we'd been self-trained and researched for weeks. Fortunately, the adjudicators told us how a debate should be, which became our guide in our next tournaments. Since then, we started winning, with experience as our only coach.

Until now, the team still doesn't have expert coach. However, I've given my juniors the foundations in debate strategies. I couldn't be happier to see the juniors that I trained now have won many tournaents and become one of the best debate team in the region.

(word count : 150)
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Does it answer the question? Do I sound self-absorbed? Any suggestion?
Thank you!

This essay begs you to be self absorbed. Which is why your answer really hits the spot. The problem, is that while the message is clear, the grammar is not. So it needs to be revised in order to produce a coherent and understandable essay. Let me show you how it can be done:

During my junior year, I established the Debate Team and became its first chairman. I had to work on establishing the team staff, which unfortunately, could not be done because none of our teachers had any debate experience. So we decided to become self-taught debaters. The problem with being self-taught was that we had no idea how to properly debate. Hence our loss during our first tournament. Out of the loss came something positive. The adjudicators and the experience taught us how to properly debate. Now that we knew what to do, we began to win tournaments, using our experience as our only coach. We still don't have a real coach today. However, the real life debate experience has offered us a more solid foundation than any coach could ever have. We now have a growing debate team that has become notable as one of the best in the region.

(150 word count)

Thanks vangiespen! You're very helpful as always :)