Wait... which one are you again?

I wonder if it's harder to form close friendships if you have an identical twin who goes to the same school as you do. Does the fact that most people cognitively clump you together with your brother/sister deter from them getting to know you as individuals?

I know that I sometimes have trouble getting past that initial awkwardness of telling identical twins apart, which makes it harder for me to move beyond that barrier and go into "real friendship" territory. It's easier if you get to know one twin first, and then meet the other twin later, but that's not always the case.