I had that problem when I was a teenager. I think it is a combination of hormones and depression. I still get that way during PMS. But it is not something to be dismissed out of hand. My mom always just told me to suck it in and that I was just fine. Looking back on it now, I know that I was seriously depressed and also dealing with undiagnosed ptsd.

Teenage thing or not, I think that it is a serious issue. Can you get in to see a doctor?