Feelings are. It is not fair, or helpful for anyone to label them good-bad-deserved-not; your mother has the right idea, but it might help if she also acknowledges the depth of your pain---which could be difficult for a parent, it is scary to think your child is suffering; and your dad may be more threatened by the emotions than your mom----do keep talking, look for the poetry (as you hit on it in your writing), keep moving if you can even when it is hard------------times come and go. You are not alone by any means----if you can, find a good therapist or consider getting yourself into doing some yoga/mindfulness (or aerobics if more your style---) a team at school? Some extracurricular activity that helps others? Let's you learn something new?---something physical and mental to help you remember, for a time, the positive feelings that DO still live inside you. When the world is dark, it seems as if it might be so always. We forget too easily better times that fly by uncounted...
And....do you have an answer to your question? Or, has this depression come unbidden from someplace inside? Is this situational or endogenous? Advice is not always useful but we tend to try to "fix" things-----sometimes the dark needs to be walked into, like in traditional tales of the hero, in order to be overcome. Or not. You know what you have going for you----don't forget, all that intelligence, beauty, and ability is still there and just as real as the sadness...