Sometimes I just feel so sad and I don't know why. The idea of depression has come to me before but there are so many people who have gone through so much worse than me and are fine. I don't even have a lot to go through. My family is lovely and good to me but I still can't help but feel so down and self-critical about myself almost all the time that I can't help but wonder if this is a normal way to live. I suffer from dermatophagia but only on my thumbs do I bite at my skin regularly.