Seven years is a very long time to be worried about something. I can’t offer a diagnosis on the basis of a letter. But I can tell you that the distractability and fidgeting is consistent with ADHD. The moodiness may have more to do with your age than a mental illness. But, again, I can’t really make an assessment via email. A professional who can talk to you and get to know you can be much more helpful.
I suggest you share your letter and this response with your parents. Sometimes worrying about something can be as distressing as the original problem. Ask them to help you make some appointments to help you understand yourself better.
I suggest you first see your physician to make sure that everything is fine physically. The teen years are a time of enormous physical growth and change. Sometimes it takes awhile for the body to adjust. If everything checks out medically, then see a mental health professional for an assessment. When you know what you are dealing with, you and your parents can make informed decisions about what to do to make life a bit easier for you to manage.
I wish you well.