Should I get tested for ADHD?

Okay, I have a lot of trouble staying focused on anything. While a teacher is lecturing I could entertain myself with something so stupid and simple as a paperclip, but then I cannot stop messing with it or whatever else is holding my attention. While doing whatever it is I am doing (like messing with a paperclip) I am not really focused on anything really but staring at the object in kind of a daze while I hear everything that is being said while not being able to process it.

Then there is another little issue. I forget stuff, a LOT. My dad can tell me to do something and it can be the most important thing in the world at the moment but I forget it before I can actually do what he asks. Later though, he reminds me again (and at this point he is pissed off) and it is like "oh duh" for me because I instantly remember everything linked to the topic at hand.

Really I just find myself distracted all the time by such insignificant little nothings. So should I ask my dad to schedule a visit with a doctor to see if I have ADHD? I would hate to pass by the chance that my lack of focus (which he sees as laziness) could be fixed by a simple visit with a doctor.
Tell me what you think or if there are other symptoms I should check for first.
Thanks

On another little note, I find it impossible to stop my thoughts. If there is nothing relevant left to my thoughts I instantly bring up a memory out of nowhere. A lot of the time it is hard to sleep at night and I have to make myself physically exhausted to fall asleep. If I do have a form of ADHD then it is a more mental hyperactivity than physical.

There is a long list of medical criteria to meet before being diagnosed with ADHD. It sounds like you could possibly have ADD (w/o the hyperactivity component). While ADHD is diagnoses in millions of kids, most actually do not have it according to medical criteria. You should see your doctor. I would recommend non-medication treatments first, because the meds used to treat ADHD today and potentially very dangerous and addictive. As an MD, I DO NOT diagnose ADHD unless a patient meets the criteria. I'm one of the few who do not advocate for drugging our children (or adults for that matter). There are lots of behavioural treatments that work very well, and may work for you as well.

Best of luck.

I have a friend that has ADHD and he does all of that stuff. I think you could have ADHD but I think you should still get tested.