I want to find someone to text and chat with in English. Although I am only a junior high school student and my English scores are not very good, I still want to practice.

You can find friends with the same interests. If you can't find them for the time being, you can start with some better friends around you. I believe you will find friends who are willing to share your thoughts. Usually read more English magazines (such as The World of English) and newspapers. Over time, your English will naturally improve.