Keep going through annoying phases... Watch
Yours could be a form of an underlying anxiety disorder. By no means am I diagnosing , it's just an observation that everything you obsess over is to do with appearance and self consciousness. I think it's normal for teenage girls sadly.
Like the person above said I recommend speaking to someone about your concerns if you feel you can x
Also - have you considered CBT worksheets?
Sounds kind of hysterical... Have you any lasting hobbies or are they all phases? Maybe try to think of the consequences before getting utterly obsessed. Sounds kinda interesting though - idk any girls that meditate haha