Loneliness Support Group
Loneliness is an emotional state in which a person experiences a powerful feeling of emptiness and isolation. Loneliness is more than the feeling of wanting company or wanting to do something with another person. Loneliness is a feeling of being cut off, disconnected and alienated from other people. The lonely person may find it difficult or even impossible to have any...

So, your mother and brother are not 100% wrong but their delivery may seem a little insensitive to someone nervous about a new environment. I am glad you took a moment to acknowledge and share how you’re feeling. Now try to decide what you’re going to do about it. Unfortunately dwelling on certain facts will not change the circumstances. Can you research your new school to see if they have any student activities which begin over the summer? If there is take that opportunity to get acclimated and possibly meet new people. That helped my daughter get rid of her fear of the unknown. Wish I would have gotten involved when I was younger.
When school begins take advantage of sports, clubs, and other activities of interest.
Hope you feel better and soon. Hugs