I'm just confused. Need help.

I always feel alone, but I'm surrounded by others. I feel that my friends don't really care about me when I go to them for help. It always seems like they overlook my problems. I'm taller, chubbier, and uglier than all of my friends and over the years it has made me feel more and more out of place. I feel like I don't fit in with anyone. I've lost so many friends this past year and I don't know what I'm doing wrong. All of my friends have boyfriends and I'm left alone most of the time. I have realized I don't have as much energy as I used to and I'm sad more than I'm happy. I always feel like I'm doing things wrong and I'm always discouraged. I don't know if it's my lack in self confidence or if I'm depressed? Someone please help me figure this out.