Wow! I'm a twin and this is the first article I've read that really puts into words how I feel about it at times. Especially:

" Not coincidentally, twins are at strong risk of being objectified. First, we get reduced to our appearances: what matters most about us is how our bodies hit the senses. Second, we get treated as fungible: interchangeable with our fellow objects. Third, in many cases, our subjectivity is ignored. People don’t deny, exactly, that twins have rich and distinctive inner lives, just as sexists don’t deny, exactly, that hot young women do. But those lives often aren’t what’s interesting about us, and they’re easily glossed over. "