I did some pottery today. I had had classes in America, but that was about ("like" is more appropriated in spoken/unformal language) two years ago. I had left two of my best pieces of work in the studio to dry. I did not have the chance to go back to the studio because it was closed due to Corona Virus and I could not get in. I felt so sad and truly regretted that I did not leave a mark of my happy memories making pottery (I'm not sure of what you meant to say here). Since then, I had been craving for the feeling of my hands on the clay and the joy of success when I finally finish a pottery. I was so thrilled when my mom took me to make some pottery. I made two cups, and a vase. The first cup was too ugly, I did not like it, but the second and the third were perfect. I would have sold them if I had ever run a pottery shop (or "I would sell them if I ever ran a pottery shop"). I am so glad that my regrets are finally gone.

I did some pottery today. I had had classes in America, but that was like two years ago. I had left two of my best works in the studio to be fired (I think that is the correct term. You mean they are still unfinished in the USA?). I did not have the chance to go back because the studio closed because of Corona Virus, and I could not get in. I felt so regretful and sad that I did not leave a mark (maybe - did not have a momento of...) of my happy memories making pottery. Since then, I had longed for the feel of my hand on clay (or - the feeling of clay under my hands) and the happy feeling of success when I finally finish a piece of pottery. I was so thrilled when my mom took me to make some pottery. I made two cups, and a vase. The first cup was too ugly, I did not like it. The second and the third were perfect. I would have sold them if I ran a pottery shop. I am so glad that the regretful feeling is gone.