Keep in mind that by this point she had already confessed her liking to me (which soon became love, according to her), at which I replied to her saying that I too, liked her (at the time it was just a slight infatuation, but I guess everyone who's never been in a relationship before can understand when a cute and nice girl confesses to you). Soon after that, she confessed her love to me, and said that I was the first person she had ever loved for real (claiming that she just used to like her 4 "exes"). We later got engaged.

At this point, I'd actually suggest counseling. Sorry, I'm teaching kids your age and NONE of them is this immature. Lots of them have had actual SO's for several years, and NONE of them has ever thought about becoming engaged..... so WHY are you talking about "we became engaged" after a few days to someone you don't know at all?

This isn't just a few hormones.... this is just being completely delusional and I really hope you get a reality check soon. Figure out WHY you are this impulsive and make such a bad decision.