This is more info that you supplied on the anxiety forum. Being stuck on a song is normal. Believing there are demons around is pretty common, but I wouldn't recommend it. As I asked on the anxiety forum, what are you doing about this? Are you in therapy?
Sorry to hear from you. In my opinion, you should consult with a counselor regarding your thoughts.
14 is a hard age! I have two sons age 14 and 15. There are a lot of hormones and emotions going on! Life can seem a bit overwhelming and it can be a transitional time. Are you getting ready to start high school this year? There is a lot of angst that happens and self doubt and worry. You are not alone. Demons though. That's a tough one.
So, how is your relationship with your parents? As a mother, I can tell you that I want to hear from my sons. I want to know if they are distressed or worried or even just what they are thinking. I know that can feel awkward and hey, as a parent who worries, I can over react. BUT, I can also help if they let me. So, I do really hope you can talk to the trusted adults in your life.
Let us know how it is going.