Also, one quick tip that can help you a lot is to rearrange the mirrors in your house, at least maybe your parents will agree on this. Mirrors weren't common until XVII th century, now you cannot find a place without one, and they do play a strong role in our mood and the view we have on ourselves. The root of the problem might be in yourself, but your problem wouldn't exist if mirrors didn't. So it's definitly something you can work to make things better.
What you should do is :
1/ Arrange your personal mirror in a way that satisfies you the most, where you don't find yourself ugly or at least, less ugly. You will have to work with lightings, and even buy one or 2 lamps to warm up everything in your bathroom. Be careful to include daylight in your tweaks if you have so. The best thing you could have is a bathroom that has no window at all so you can fully customize the lightings. The best light for you might be an ambiant one not very bright. Find your best perspective.
2/ Avoid other mirrors, all of them, may it be at home or in public spaces (unless one of them reflect an image that satisfies you of course). It's pretty easy to do, I can tell you because I do it. Just tell yourself that in your current state, mirrors won't help you, they send a distorted image of you that will mostly affect your mood.
I avoid mirrors because I often have rings around my eyes, wich my mind tends to exagerate a lot if I see my face in a mirror with a specific lighting. Then I usually get very tired and unconfident because of what I've saw, even if I were in a good mood a couple of minutes before.
3/ Maybe it's good idea to avoid to look at pictures of you for now, because of your mental state, most representations of yourself will hurt you.
Eventually things will get better as you grow up, but make sure to see a therapist as soon as you are able to. Until then, you can try what I've suggested you to make your life easier, you'll be less focused on your image, wich frees some space for other thoughts. Good luck
