A bit confused..

For about 3 years now; since i've started highschool, i've had this need to look better. I felt disgusted with myself and wanted to change so many things. The most important thing I felt was my weight, I wasn't fat or anything.. but I felt really chubby all the time even though people said I wasn't. Here I am 3 years later, people say I am a very good looking guy but something tells me that's not enough, I still feel like I need to lose weight. I'm not sure if I do have an eating disorder to be honest.. I mean I don't eat breakfest or lunch at all on school days and try to always make sure I eat around 1,500 calories or less. When I think I've eaten to much I make myself throw up. The thing is I still think I weigh a healthy weight, which is around 116 pounds. I'm a 16 year old male and i'm about 5'10 if that helps. My mother and sister say I need to gain weight but it really makes me mad when they say that. I know I am not fat but I definetly don't need to gain weight. I'm starting to get sick of this though, I mean feeling depressed almost all the time. I have become a lot less sociable at school.. sometimes even literally ignoring new people I meet. I just feel so tired sometimes at school that I just want to pass out and go to bed. I get irrated and mad very easily, especially if somebody is eating food. When somebody in my family constantly eats food or chews loud I feel like going insane. They call me bi-polar and say I need help alot, that hurts the most because it feels like they make fun of me and don't care at all. I don't know exactly what is wrong with me.. but I know something is. I feel like there is a big empty whole inside of me, and like i'm useless. I also don't feel much emotion anymore like I use to.. such as happiness, guilt, or even crying, most of what I feel now is sorrow, anger, and 'empty'. I try to put on a fake smile as much as I can because I don't like looking pathetic. I'm just tired of it all.. of being fake and insecure. I just want to know what is wrong with me. I feel like talking to somebody but I wouldn't know where to start.. which is why I am here.

I just want to know if all these things I feel is just because of how i'm eating or if there is more to it. I also still am confused if I even have an eating problem, it's not like i'm starving myself. I just need guidance and I am really afraid.