AKG, you remind me a little of myself when I became a Brony. I ended up listening to This Day Aria and I listened to the song about five times. I realized that I liked a show for little girls and that made me feel odd.  At first, I was very secretive about my liking of the show and tried to get rid of it. (You may or may not believe me, but its the truth) Nevertheless, I couldn't, so I embraced it. Eventually, I told my family and close friends about it and they are fine with it. In your case, if you don't want to continue liking My Little Pony then don't think about it. I suggest to focus on other matters or hobbies. As far as I am concerned, when it comes to school, just don't tell anybody. Good luck and Happy New Year!