you can tries these following things. 1• positive self talk. 2• you can start or try talking with your classmates or friends. 3• having a group chats. 4• for best self esteem u can take care of yourself and love yourself. 5• u can change your physique by exercise or gym, dress well for great confidence. 6• don't feel negative and don't give up. i hole this things can help u. all the best bro✨✌️