However, confront me during my introspective moments, and you'll find that I second-guess thoughts very frequently. Perhaps this is the downside of seeing multiple interpretations of everything, and the desire to integrate different viewpoints into a model. Suddenly, I'll change from a self-controlled being to the most doubtful, and confused person in the room. It reverts back when I have to get things done, and there's no time to over-analyze every possible flaw -- only for mindful action and keen adaptability.
Getting by on a daily basis was not easy, like you, I had little motivation to do anything beyond things that weren't immediately relevant to society's idea of 'success'. I simply wanted to figure out what life meant for me, and to explore the extent of my mind and values. Everyone thought I was wasting my parent's time and money on introspection, and a part of myself had agreed with them, but subconsciously, I knew I couldn't go down that path anymore. For the next two years, a battle of two inner wills drove me up the wall, causing me to become mistrustful of my "softer", dreamier judgment.
Fast-forward six years later to age 21: every failure, achievement, skill, characteristic, knowledge and wisdom I had began to crystallize into a more global perspective, allowing me to overcome previous difficulties with relative ease. I use my advantages to offset the disadvantages, synthesized opposing personalities, and forced myself to cooperate with the lazier, slower voice, or whatever my ambitious self likes calling it. And the thing is, it works. Very well. Just don't give up -- even when you fail (trust me, this will occur a lot in the beginning). Then proceed to practice your weaker attributes like hell with the intention of getting better each time. Optimize your strategies and tactics whenever you can, preferably with the help of numerous references.
Looking back now, I sometimes think we place too much importance on bemoaning and criticizing the abilities we don't have, instead of aiming to improve them by following our natural rhythm and needs (however "strange" they may be). If I had to redo the last six years, I'd say this to myself: "Self, you're weird compared to most you know. Maybe even a little nuts. You have different desires, and there's no point in trying to jam yourself into a conventional system, thinking that's the only way to personal achievement. So let's look outside of the box. What can you possibly do to synchronize your current skills and tendencies to your goals? Don't discard your quirks [ahem, like ADHD], use them. If you can figure out the critical elements and its formula, I swear you'll nail them down cold."
TL;DR version: Many skills are improvable, if you're willing to dedicate the energy to make them work. Everyone has their problems and times where their "strengths" undermine their best intentions, yet understanding that potential and incorporating those benefits into one's long-term strategy is what moves a person forward.
Furthermore, you can't possibly be worse than someone who has earned academic probation/suspension at 3 schools for three years, performed every single procrastinating technique known to mankind, and holds arguably the worst attendance record in high school. There's still a great deal you can change right now, step by step. If someone with an unpredictable attention-span and poor social skills can turn their act around by 180 degrees, you can too.
No magic required, honest. Only faith in yourself, smart training, and being resourceful. It took me six years to learn how to command my ADHD and three to socialize. Perhaps you could do much better. If you want help or additional tips, PM me. I know practically everything about there is to know about failing, concentration, and motivation.