ADHD does not inherently mean you are hyperactive, there are actually 3 subtypes. I have inattentive ADHD, meaning I lack the impulsiveness and hyperactivity, but I have a ridiculously short attention span, I'm very easily distracted, I'm forgetful, disorganized and procrastinate to an extent that it severely affects my social, academic, and home life. I'm also constantly fatigued. Yes, some people experience these things from time to time, that doesn't mean that everyone has ADHD. Sometimes my blood sugar is kinda high, doesn't mean I have diabetes.
ADHD is also not exclusively found in children, there exists something known as Adult ADHD. You don't need a diagnosis from childhood to go see a doc, I waited to see one until med school. School is a series of steps, I learned to deal with ADHD during high school and most of undergrad, but I couldn't adjust for med school. The people on here saying stuff about laziness are just being downright offensive. You need to evaluate yourself, and then have a doctor evaluate you, and maybe you can get some help. Your psychiatrist has been to medical school and has completed a residency wherein their sole goal was to evaluate human behavior. If you think that any undergrad can just waltz in to a psychiatrists office and spill some bull and somehow trick the doctor is being foolish. Does it happen sometimes? sure. Does that mean anyone can walk out with a diagnosis? hell no.
Go see your doc.