I eat a lot but I'm still anorexic?

I'm 14 I eat like a pig I often eat two servings of food for breakfast, lunch, and dinner. I eat sevral high-calororie snacks every day.(but I do eat a lot of fruits and veggies) I eat candy and soda almost every day(only diet soda though, I don't want to hurt my teeth and bones) But I'm still anorexic! I only weigh 90lbs and I'm 5' 5", I look skinny and all my friends are jealous! They all weigh more than me, except for this one girl who has the body of an ten year old. Most of them say I just have really high metabolisim, I suppose this is it, but is that bad? Will it lead to serious health problems? Diabetes run in my family, will my eating habits cause diabetes? I am pretty athletic, I jog a couple times every week and I'm really active.I don't really feel like going to a doctor because I'm healthy otherwise and I feel great! I always have lots of energy! I also get extreamly cranky and depressed when I'm hungry. If I skip meals for a whole day I freak out around 4:00 or 5:00, to the point where I burst out in tears. But after I eat I apolize for being mean and I'm pretty happy.Is this bad? Do I have a health problem?