This is quite personal, so if you don't care to read it , please skip to the second paragraph. It's only a background
Sadly not - My mind is in a constant state of flux - my friend thinks i have body dysmorphia. I'm not so sure. But I can go from wanting to bulk up and get big one week, to bordering anorexic the next, to freaking out about being 'too skinny' a month later. It's a massive issue that I've spent years trying to deal with, as it's not just the mentality towards my body image that changes. It can affect who I get along with, how i go about my daily routine, my moods, and even what I find enjoyable or not. It's something that has prevented me from reaching my potential in life as well, which is admittedly quite pathetic. Now I have found something I truly enjoy however in Rugby. I think that if I keep playing, then maybe, just maybe it'll help keep me stick to one specific body image. If I play rugby, I gotta be built like a rugby player after all. So fingers crossed It will give me some much needed stability.
Sadly I don't really have any great advice for you about this issue. 'Teenage' angst isn't really something that magically leaves you when you get older. It's something we all have to deal with and hope that eventually we will get over. Some people take longer than others though, and it's okay. The important thing is to not beat yourself up about it. I used to , and it just made things worse. If you accept yourself as you are , even if you're not entirely sure what that is, it's better than always striving for something that you might not be. Just relax and go with the flow.
p.s. I like the use of the Soul Eater moon there...