I have yet to post, but I thought I would as part of me was slightly enraged while reading this. This has already been pointed out but bears repeating: not everyone is you.
Yes, SA, just like every other mental illness/disorder is just that, but it also a very personal experience. Meaning, while we may have similar symptoms, their severity and manifestation may vary greatly. Although, some seem to be forgetting that it is also a disorder as well. SA and along with depression isn't "growing pains" or "trendy". Trendy? I found this particularly hurtful. There's a world of difference between posting sad poems on tumblr and reading Salinger and Plath and coping with a mental illness. Melancholy might be romanticized, but the latter can't and shouldn't be.
As other people here have, I dealt with anxiety since childhood and depression throughout my teens. I haven't had any close relationships, sense of accomplishment, and missed out on a lot of experiences. Many of these missed experiences have given my peers a foundation for growth that I feel I'm lacking. Stories and pictures to look back on I'm also lacking. Now, again this isn't true for everyone, but no matter how your SA appears at this age, it difficult to watch others form lasting social bonds(as this is an age where that happens for many) while you either aren't or can't fully enjoy them. So while it's nice that you feel things are improving, please don't draw conclusion on our disorders from your experiences.