I don't understand why you feel an academic essay will be a good description of who you are. The best way I find for understanding the personality of a person is through interactions. It's not very useful in saying you are INXX because you do so and so things. Frankly everybody regardless of their type will likely in one time or another do the exact same. Because a well-balanced individual should technically use all 8 functions. It is the degree and familiarity of use that determines type.
After you learn the basics of the 16 types, then you should step back from it all to look at people as individuals instead of just type. Because you're right, the model is overly simplifying personality. It's good as a starting framework but it's nothing more than that. A framework.