Olha, claro que existem outros meios, mas eu escreveria assim:
I am very happy today because yesterday I went shopping at the mall with my friends and cousins in the shooping mall. It was a very good time. We went to the food court and ate pizza. We don't eat pizza often frequetly, we just eat it only once a month.
In the shopping mall We bought some very beautiful clothes at the mall, very beautiful clothes and some shoes too.