Im 5'8 and lost 80lbs, and only recently could I truly see it myself. Two dress sizes down told me by clothing alone that I was smaller, but the mirror looked the same. One morning my side profile in the mirror finally showed me how much of me had disappeared. Face on is trickier since my belly fat sits in an odd way (the hips-to-apron zone refuses to budge), plus dysmorphia makes me harsh on myself. So maybe really look at yourself? Skip the baggy outfits when you do, they warp how you see yourself. A hundred pounds gone must come from somewhere, and while some muscle may be lost, its nowhere near 100lbs of it.