That was my reaction the first time I took medicine for ADD. I was 21 and it was like a whole new world opening up, everything was clear, calm, slower. I remember thinking so this is how everyone else thinks. This is how they pay attention and stay focused.
I knew it started to work because I felt I could do anything. Kind of in an empowering way but more so that I started doing things I would have considered dreadfully boring before. I didn't get distracted within 2 minutes.
The best part came when I was sitting in class and I heard what sounded like keys jostling in a bookbag. Normally I would have turned around and looked, but not this time. No, this time I just kept paying attention to the professor.
I spent 21 years not realizing that I was different from most people and nobody ever caught on because it wasn't glaring. I was always interested in school and always learning so no one thought I had problems. I would read ahead and learn advanced things in math, science and technology. I would ace all tests but not do schoolwork because I couldn't concentrate. This allowed me to get into great school simply because of my high SAT scores even with my slightly below average grades. The amount of times I was called lazy is astounding. People would tell me, that I had potential but I wouldn't become anything if I kept slacking, procrastinating and day dreaming.
OP, don't cut yourself short. Having ADD or ADHD doesn't mean you're dumb. Your mind is racing at a million miles an hour and you don't have any brakes. My nephew has ADD and everyone swears he isn't bright at all, but because of my experiences I know how his mind works and I know how to bring out the best in him. When I do, everyone is astounded at what he knows and is capable of.
P.S. lay off the caffeine. I know I used to take a ton of energy drinks in, what my doctor called "an unconscious effort to self medicate." The prolonged abuse of caffeine can easily cause cardiac issues in the future. I was and still am fairly athletic and in great health so I'm fine despite it but be careful with it.