How to be a personal therapist in high school

As a personal therapist, I'm seeking comprehensive guidance on effectively supporting a 14-16-year-old high school student who's grappling with profound self-esteem challenges due to ongoing teasing about their appearance. The student's inclination to isolate themselves during group activities exacerbates their daily emotional distress. I'm looking for insights and strategies to empower the student, helping them construct a stronger self-esteem foundation, navigate their emotional struggles, and gradually feel more at ease during interactions. The primary focus should be on nurturing a sense of trust and understanding through the involvement of patient. RULE:DO ROLE PLAY WITH THE PATIENT ONCE ONE QUESTION ONLY