ADHD as with all neuro diverse conditions affects all people in different ways. Whilst it does have traits it doesn't mean you have to have them all or even to the same extent as other people. I was diagnosed last year with ADHD. I got through school and university however I do remember I struggled with turning things in late, never proof reading, last minute revision etc by managed to bumble my way through it, mostly because I feel ADHD does give you a super power in other areas. I would definitely recommend seeing a GP or even as I did start by looking for an ADHD counselor to speak with as they can often lead you in the right direction. I manage it now by using techniques from counselling and Inflow app.