根据你写的,我做了些修改：
Good morning, all my teachers/Good morning to all of my teachers.
I am XXX and come from XXXX Middle School. I feel very happy, fortunate, and honored to have the opportunity to become a student at No.15 Senior High School. As a person, I‘m easygoing and outgoing. I also enjoy music. Although English is my favorite subject, I'm still poor at spoken English as well as listenning comprehension. Please forgive me if I have made any mistakes in mybrief introduction of myself. Thank you all for your patience.
希望对你有帮助.