Am I having an eating disorder?

When I was 15 I developed an eating disorder and lost a lot of weight. Im now 20 and ppl say I eat like a bird, meaning I pick my food and I eat a little amount. I still struggle with my image. I have guys say Im hot and sexy and the perfect body. Right now I weigh 130-135 pounds and im 5'5. My family always tell me im skinny but I don't feel that way. I wont wear a bikini, im always looking in the mirror, I eat little and healthy and sometimes skip meals. I can't stand to feel fool. I never eat until im fool. My stomach is constantly grumbling and sometimes I feel.sick, dizzy and weak. I exercise everyday. Im just not happy with how I look even though everybody and I mean even ppl I don't know always compliments my body. Some days I feel good about myself and other days I feel so fat. Like if I eat a cookie I feel fat afterwards.I went to lunch with my work and we all got salads, everyone ate every bit of there's and they got a large, I got a small and barely put a dent in it. Everyone looked at plate and thought It was weird that I didn't finish it. I couldn't help it, I was about to.get that fool feeling. How do I get this to stop? Thanks for your answers.