I enjoy studying when I get into the mood; however, it's the first twenty minutes of study that puts me off. The workload seems long and boring and I don't seem to get much done. Usually, after twenty minutes, I begin procrastinating without having completed much of my study.
Since you're tall and probably have long legs you should do taekwondo. Taekwondo is the most sport like and least self defense like out of the three. So if you are looking to for a martial for self-defense taekwondo isn't the best option. Akido would be the most self-defense like and karate has...