I'm also in my teen and I have A.D.D. I don't let that get in my way of what I have to do too become successful.
ADHD is *different* not *worse*. Don't let the word "Disorder" at the end confuse you. Medicine calls so many things disorders you can expect any day to see journal articles on "Robust health disorder" called that because the majority doesn't have it.
So ponder this - There are ways to harness shorter attention span into an advantage. Find one and use it. Consider that Isaac Newton is thought to have Asperger's Syndrome. He sure harnessed that to an advantage!
I have ADHD with hyperfocus so I've had time to ponder it and find the advantages. To me the majority appears to have "focus deficit disorder". I can zoom my focus down to laser sharpness at a level most can't. It allows me to solve problems that most can't. There's a difference between hard work and intense work. Hard work - Here's a pick axe and a mountain. Use the mountain over there please. Intense work - Here's a problem the rest of the team has been frustrated with for weeks making no progress. Focus your laser on it and burn a hole int he problem please. If you're familiar with Einstein's work think of the photoelectric effect that he won his Nobel Prize for. You can aim a beam of red photons at a mix of chemicals and it never ignites. Send in one blue photon and boom you have your reaction. The majority are the red photons. The ADHD with hyperfocus folks are the blue photons. Our advantage is intense work instead of hard work.
I'm in IT. I'm an ace debugger. It's the laser focus and short term attention harnessed as an advantage.
What you're doing isn't working? Try something else. For years I worked on reducing my weaknesses. That's the road to mediocrity. Then I worked on increasing my strengths. That's the road to excellence.