Am i becoming a anorexic..?

I don't really eat that much. Usually i might eat a pop tart in the morning, maybe another one a few hours later. That and plus some wheat crackers and a V8 drink. I never eat big meals. I also work out a lot. Mon. Thur Fri. First i do 500 crunches, 100 40 pound curls for my biceps, and to top everything off i do a run and walk for 1 hour and a half. I never been so slim and toned in my life and whenever i go to the swimming pool i get a lot of strange looks and someone even had the to ask me if i was anorexic one time, lol. Anyways, i don't think i have an ounce of fat on me. But this whole thing worries me in a way if its all good or not...