The only way to know is to get an ADHD evaluation. Your school psych should not dismiss you without investigating your concerns. Knowing that it’s ADHD, if it is, then opens the door to understanding and treatment, which will help you a great deal.
This symptom test might help you determine if you’re on the right track, and you can print and take the results to your psych. I know you’re a teen, but the adult test will be more appropriate than the one for kids at your age.
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism