I saw a nice mixture of Monk, Soldier, and Dragoon, but in an attempt to be somewhat helpful with your votes, I'd go with Dragoon. Your introversion mixed with your confidence, your overall aloof and reserved nature, and the fact that you're calm all speak a lot in favor of this class, and I see them as a class to look at things impartially. You like to work by yourself rater than take charge, which reminds me more of Dragoon, even though certain Soldiers definitely share this trait. Your negative traits do remind me a lot of Monks as well, but it's not really supported elsewhere. Your identification with Lightning -- "I feel like her situation with her sibling (Serah) is similar to what my sister and I have. Not only that, she has a hard shell that isn't easy to penetrate- but when you do, you can be assured that she will be loyal. Family and friends is everything" -- reminds me a LOT of Dragoons in general.
Monk