One possible version:
Everyone has to grow up, with which come some pains. I’m no exception. One bitter memory is still rooted in my heart. We once had a broadcast gymnastics competition in primary school. Certainly school uniform was demanded. But to me, the plain, ugly piece of cloth was unbearable. So I painted a colorful bird on it, thinking I would be so shining the next day. Unfortunately, we lost the first place due to my work of art. Being different did carry a price.
For a couple of days I was overwhelmed with shame and guilt. Finally I realized that being different is good, but what really matters is where and when. Now I’m a high school student. I absolutely know on what occasion I should stay different.