What's up with me?

Hm,where to start.I don't know why,but...well my skin is kind of pale,not really pale or ghost-like just pale compared to other people's.For some reason I always look sad and tired even if im not.Like I hate looking in the mirrors at places because other people look normal but I always have dark circles under my eyes,which look bad with my slightly-pale skin.Its hard to describe but its like if you stand back you cant even see my eyes well cus its all dark around them and my mouth,and I dont know.Like sometimes my friend will say "What's wrong?" or "You look tired" when I'm not idk why because they think I look sad and stuff when I'm not?I'm 12 and I get as much sleep as I can (I try to fall asleep) have to wake up at six and get about 7-8 hours of sleep.I just looks so sad and tired and unfriendly because of my bad skin.I hate this,.What should I do?