The thing with bigorexia is that you don't see the real you in the mirror, just like an anorexic person still sees the fat person in the mirror. I have gone from 136lbs at 5'10" to 207lbs and i still think i just look ok. I constantly compare myself to others in the gym who i think are close to my size. Yet i am constantly told iam bigger than them and in my head i know that i must be but i just can't see it. I guess another problem is it's not like you can stop everyone and be like "excuse me, can you stand shoulder to shoulder with me so i can see how we compare?"
There is a guy who trains in the morning at my gym and he is constantly asking my advice and complimenting me. I dont necessarily see myself as bigger per se, i see myself just as having a better overall package and looking more like a bodybuilder. But when he told me he only weighs 168lbs it hit me that i outweight him by 40lbs so i must be a lot bigger than him. Self image is a tricky thing to change, at least for me.