I agree with what the person said previously. Being diagnosed with ADHD is a difficult thing to handle. But it is definitely better then leaving it unnoticed.
I have had ADHD for 8 years (diagnosed at 10) and growing up with it was very difficult. Even to this day I still have a severe lack of focus at times. However, my diagnosis was one of the best things for me. I was able to get access to certain resources (particularly relating to school) that helped me greatly. Also, I learned that having specific outlets (for me it was Karate) and great support, is of great importance.
No matter where you are in life, living with ADHD is very doable, it just might take some accommodations. Taking advantage of your resources and maintaining good support is something that should be done. If your ADHD proves to be an even bigger problem, seeking medical help or counseling is always an option (though I never did it myself).
Anyway, best of luck! Remember, we're here for you whenever you need it too!