I am in the same boat as you NyanShoujo. It has been even less time I've found out about ADD for me I was told about it around a week ago and since then I have just gone to different sites to find out what is going on. I am 23 years old and all the way through school I have had the same things you have gone through, I think I have read somewhere that if you have 6 symptoms or over, you may have AD/HD.

I find myself sort of "daydreaming" when I am directly speaking with someone. I also find it difficult to connect with people's emotions and thoughts. Like people have come to me to talk to about a personal subject or w/e and I feel like I don't care but really wanting to care, I will show them I do care and I will comfort them, but my mind is just travelling else where.

It came about for me, because of my lack of ability to hold onto a job or an apprenticeship, I just lose motivation and I get so frustrated with myself when the inevitable happens.
I pick things up very quickly, which is what my dad is most annoyed with. My ability to (example) pick up a guitar and learn a song really quickly when I just started playing, I have even found being impressed with myself! But I will never see it through. I never keep playing and maybe make something of myself with that subject.