You probably should get a doctor to check it out, see if there's anything that would be helpful to work on. Some of your symptoms sounded like they could be bipolar disorder also. Others just sound like your mother was right :-) and/or you were never "taught" to pay attention and/or interested in persuing any project to completion. I was like that growing up (I'm 56) and I am not ADHD though my sister-in-law teases that my 65 year old brother is. But if you're not unhappy with how you do things, if they don't interfere with how you want to live your life, then it's not really a problem? There's a certain amount of truth in the proverbs like "Defeat isn't bitter if you don't swallow it." If you are having trouble holding down a job or are working hard to get good grades but you keep getting in your own way, then see a doctor/specialist and see if they can help?