I don't think this is an eating disorder at all simply just horrible habitual eating habits. I would suggest finding a nutritionist to include healthier foods in your diet. Eating junk food can have horrible physical effects on your body later on in life. While you may not be overweight at all you are not providing your body with the nutrients necessary. Therefor the nutritionist will help you come up with a good eating plan while not cutting out all those snickers bars!

Before seeing a nutritionist i'd suggest a full medical check sometimes weird eating is because of something we lack or need. At age 38 I discovered that the reason I ate food with my salt was that I have very low blood pressure & when I fell pregnant with my daughter (now almost 16) I started craving ice, I chewed the stuff (yes, just plain ice) night & day (drove my husband insane at night) & I kept it up for several years afterwards ( & have recently started it again) eventually I found out that it was probably due to low iron levels (i have always been aneamic but..).

So I suggest you get sugar & cholesterol levels checked & everything else & do some on-line research about what causes a craving for sweets or why can't I eat anything but sweets?

Because if there's an underlying medical issue(which may be minor) then a nutritionist won't help, but if there's not then see the nutritionist.

Also maybe the "healthy" food you are trying to eat isn't what your body likes. My daughter eats any vegetable except potato (in any form) eats all fish so long as it's not fried (prefers grilled) eats all fruit except banana (to which she's allergic) & getting her to eat pasta, rice or bread of any kind just isn't worth it, she loves nuts, cheeses & desserts & gets all the nutrients she needs from foods that "turn her on" instead of "off".

So maybe try looking at some recipe books/cooking shows etc to see if there are some "healthy" foods that appeal to you & try eating them & see what happens.