You should not jump to any conclusions, procrastination does not directly mean that you have ADHD or ADD. The diagnosis should be made professionally through tests by a psychotherapist.

If you are diagnosed with ADD you will need a very individual treatment. This usually consists of behavioural therapy that should be supported by medication. With the help of medication you build up routines (like brushing your teeth, which you have probably already established and do not forget, despite ADD) that ADD does not prevent you from doing because they have become a habit. This is very individual and has to be repeated every now and then when life circumstances change.

In addition, depth psychological treatment is useful to deal with depth psychological problems that may have arisen due to the untreated and undiagnosed ADD (depression, anxiety disorder, eating disorders, etc.).

And even then, ADD may prevent you from doing certain things. For me, for example, studying just didn't work out, that's something you can accept and be OK with. Someone with an IQ of 80 can't study, just like a wheelchair user can't run a marathon, no matter how much they want to. So it may also be that ADD means that studying doesn't work for you either. This is not meant to sound demotivating but sometimes it is better to focus on your strengths instead of trying to compensate for your weaknesses.

And to answer your question: You never grow out of ADD. It is a congenital predisposition that can occur in various degrees of severity. To be precise, it is an adaptation disorder that makes it difficult for you to adapt to new life circumstances because it affects your sense of time, your perception of time, your reward centre and your ability to filter and prioritise external impressions.