Open Question: Could this be ADHD or something else?

I know it's summer but I'm horrified to go back to school because my school hate me because of my 'behavioural problems' and my lack of organisation. I apparently have the 'attention span of a goldfish' and I always start doing one things and ten seconds later I'm trying to sort something else out and have no idea what I was supposed to be doing. My family are getting annoyed because I 'act