Anorexia?

I read somewhere that schizoids tend to be very skinny because they don't care to maintain their physical health very well due to lack of motivation (ik this isn't a problem for everyone with it) but at what what point would it (or even could it) be considered anorexia?

I don't hate my body or obsess over calories or hate eating but I hate the fact that it's something that I HAVE to do. Like most times eating a meal just feels like a chore that I just need to get accomplished but not because I particularly want to. It's just a concern for me because I'm 6'1" male and weigh around 140lbs (give or take ~5 lbs)