There are some great resources on ADHD that can help you understand what it is. There is a book called 'Living with ADHD: Stories from an Afflicted Professor of Medicine' (or something to that effect) that you can find online for free. It is about 50 pages, and tells stories about ADHD and what the guy did to manage it, and what you may be able to do too because he provides suggestions. The best part about the book is that it is funny, kind of sarcastic, a short read, and is actually written by a university professor and doctor who has ADHD and struggled with it all throughout his career.
Alternatively, there are ADHD coaches and support people who may be able to provide supports as well. There are always listeners and therapists available on 7 Cups who help you as well!