Nothing to fear, if you do have it your brain has always been this way so in a sense nothing has changed. That said a diagnosis can bring a lot of clarity, understanding, and help you form strategies to do better.

If you seek evaluation, seek it from someone with a lot of experience with Adult ADHD. If you get a diagnosis, make sure you work with a doctor who starts you at the lowest dose and slowly ups it as needed.

How to ADHD is a great YouTube channel, if you are curious.