I am 5'10 and when I sit next to 6ft or taller people, we seem to be the same height, but when we stand up, I am noticeably shorter... Our eyes are on the same level and our shoulders too. Even though my legs don't seem short. I sometimes feel that I have too long legs compared to my upper body, but when I compare my sitting leg length, it seems their knee is always much farther than my knee is. I am confused.