However, there are recurring Se themes here too:
"I am very dutiful. “Work first, then play” is one of my mottos."
"I like to do things my own way and it takes a lot of time before I can trust someone, after having analyzed his words and actions for days."
"If someone insults me (very rare, I don’t know why) I always find a way to counterattack him."
"I am VERY indipendent. Since 1st grade I haven’t had any need for help (homework, time managing, money managing) by anyone. At times, it can even annoy me being helped when I already know how to do something. Usually I am the one who helps (even if I’m not the most altruistic person on this planet)."
To summarize: you seem to be a diligent, organized, but also suspicious person.
I think you should look into LSI. Even ILI may be more likely than LII.