Hi....I've been taking adderall for a long time. When I first started taking it, I had that "speeding" feeling also. It stopped after a few days, maybe a week.
If you keep having that feeling....definately talk to your doctor about the dose or switching to another med. They all work a little differently and maybe one of the others will work better for you.
Most adults aren't ADHD because they aren't physically hyper....most are like me, ADD. Having problems with organization and focusing are part of ADD.
BTW...a friend's college age daughter was on adderall and had anxiety problems. It turned out to be caffeine from drinks like Mountain Dew, Jolt and those energy drinks.