GPT答：

7i24.cn

As an AI language model, I do not have personal experiences or opinions. However, here are some significant events that occurred in 2021:

- The COVID-19 pandemic continued to affect the world with new variants emerging and vaccination efforts ramping up.
- The United States Capitol riot took place on January 6th, resulting in five deaths and multiple arrests.
- Joe Biden was inaugurated as the 46th President of the United States on January 20th.
- Pro-democracy protests erupted in Myanmar after a military coup ousted elected leader Aung San Suu Kyi.
- Israel and Hamas engaged in an eleven-day conflict that resulted in hundreds of deaths and widespread destruction.
- The Tokyo Olympics were held under strict COVID protocols after being postponed from their original date in 2020. 
Overall, it was a year marked by ongoing challenges related to public health, political unrest, and global conflicts.