A little peace of mind on folkloric changelings?

I have quite a bit of research on this subject and, frankly it scares me. I believe I may be a changeling, a faerie that takes the place of a human child. I fall under many of the categories and identifying trademarks that changelings possess: I feel and act more intelligent than my peers, I am malicious and rude, I am ill-favored in appearances with a large marking on my face that showed up when I was young. I am also at odds with society and play three musical instruments and have a vast interest in folklore. Even when I was younger (what I can remember anyways) I always left cream out "for the faeries" even when I was too young to know the myths. I eat a lot but never gain weight, and am extremely picky sometimes refusing to eat meat. As I have gotten older these anomalies have gotten more abundant, even going as far as openly scorning most of my peers. I would greatly appreciate logical answers and I will ignore or tease flamers who says stupid things.