Am I depressed or just sad all the time?

I am always sad. Like sure, I do have some occasions where I can get happy and laugh, but most of the time I am sad. Mainly at school. I feel so ugly, and unwanted, and weird. Nobody likes my personality! I always try to be nice and I don't think I am ever mean. My hair is horrible but anyway. My life is probably awesome, but I hate it so much. I don't cut myself or anything but I just feel so sad! I am 12-13 btw. I have lost all my friends, all my good ones anyway, and I'm so sick of being judged and having to think about fashion and beauty before I walk out the door! And how ugly I am! But I just feel so sad! Like I can't explain, how miserable I feel. I feel fat too! Am I depressed? Clinically? Or unclinically? Or am I just 'always sad/unhappy'?