Congrats on all the work you have put in to achieve that loss, stunning
It sounds like you may have some degree of body dysmorphic disorder. I certainly am not a doctor and dont at all mean to sound critical, but when someone who is a healthy weight sees themselves as fat (or generally cant see themselves clearly physically), it sets off alarm signals in my head.
It isnt so uncommon for this to happen. Focusing on our bodies to such an extreme degree, as is perfectly understandable during the process of weight loss, can cause us to become so hyperfocused that we cant see our body clearly and appreciate the loss...and also feel too critical when we eat slightly imperfectly.
If you can, I strongly urge you to see you primary care physical or a mental health professional to discuss honestly your feelings. If you cant/wont, I would at least suggest you try to involve yourself in something like yoga or team sports, where the emphasis is more on the whole body/mind connection and/or the beautiful power of your body to perform.