eating disorder?

So i am a naturally thin small person and I am very happy with my body -- of course I can tell when I'm bloated or not and I prefer not being bloated but even then I don't have many concerns about the way I look. I may be totally far out on this and I totally don't mean for this to be offensive if it's not at all an eating disorder I really don't know much about it but anywayyyy considering my size I am quite a large eater and I've never been very worried about what I eat (good and bad I guess) and usually I eat a lot of crap. But for the past couple days I've been experiencing myself feel really hungry and once I eat the smallest thing I'm really full. Also, i only want to eat healthy stuff and I'm fully capable of turning down junk food which is usually impossible for me. I've been also working out the past few days and I legitamately NEVER work out. I'm a little bit worried I might be beginning some type of eating disorder that I'm not conscious of? Is that possible? I just don't want to become obsessed with these things because I'm already happy with myself but I feel like it's going to become out of my control?