As someone who has been medicated for years now, just try it. For most people it's not habit forming. Also getting diagnosed doesn't mean you get medicated. It does help you understand why you are the way you are. Medication doesn't undo the lifetime of trauma you've endured and all the bad habits that stem from that. There is a lot of shame attached to ADHD that is external to the condition. You solve that shame and anxiety through therapy. The medication makes it less emotionally taxing to change tasks. It also helps suppress rejection sensitive.
It doesn't change you. You won't be less creative. It won't even stop you from hyper focusing. It will let you stop hyper focusing though. Having better priorities is still on you, but it's easier to stick to them with meds and therapy.