Possible trigger: eating disorder

As long as I can remember, I've been calorie conscious. I read the label of everything before even thinking about eating it. If I eat out somewhere and don't know the exact calorie count, I work out when I get home until I feel I've burned the extra calories off that way I don't feel like I've gained weight from eating them. Now, I know that I am not fat. I'm not even remotely overweight. I can see that I'm not, but yet still cannot seem to ignore the nutritional information on the food I eat. I feel like it's controlling my life and don't know what I should do. My boyfriend and I live together and it's difficult trying to explain to him why I would rather eat one thing over the other without saying it's about the calories. I just wish I knew how to better control the obsession..