I have the opposite. I've been seriously into lifting for the last four years and at 6'3" went from 170 lbs to 215 lbs. (I know what you're thinking, but in verified!) I'm 13% body fat, and I know I'm muscular, but when I look at myself from my eyes I see the same skinny guy I used to be. My shadow seems skinny to me. Then I see myself in videos or pictures with other people and I can tell I'm muscular. But it just... It's dysmorphia.