Soccer championship

I participated in a soccer championship at my high school a few years ago.
To be frank with you, My team got 1st prize but, something happened to me.

「To be frank」という表現は失礼なことを言う時を使います。リサさんのチームが第一位だったことは事実だから、それという事が失礼じゃないです。

My team consisted of strong members because they loved soccer or sports.
However, it was said another team would get 1st, by everyone because most of them belonged to a soccer club.
We talked about a strategy to beat them and decided to carry it out.

Fortunately, my team kept winning.
When I ate lunch with my team members, I felt something. My legs were strange somehow, but I didn't mind because my legs did not hurt.

After lunch, the final game started. We caught the soccer ball and passed it violently to each other. （この文はリサさんの伝えたいことが少し分かりにくいです・・・）
So, I felt my legs were strange. Eventually, I couldn't move. My legs started hurting badly. I stopped in the center of the field and cried out "Please stop!"

バスケは「Court」でしますが、サッカーや野球は「Field」でします。

The referee blew a whistle and the teachers came to me. "What happened!?", they asked. My team members were surprised and asked me whether I could continue or not. I had to answer "no".
Insted of me, my friend joined the game for half of the time.

At that time, I had mixed feelings about this.