For me, my boys didn't seem to have any unusual bond with each other until they were more like 2 1/2. As babies they could have cared less about each other, they were more individually bonded to big sister.
Just because as babies they are acting like babies and not really that aware of the other doesn't mean that they won't have a twin bond. I got caught up in the expectation that they should be psychicly bonded from birth too (mine are MZ, so lots of pressure there), but then I realized I was being silly. I was worrying about this when they were 5 months old for pete's sake.
I don't doubt that there are some twins that have that special awareness shown openly from birth, but in talking to other moms, the experience we had (seemingly not that different until they were older) seems to be pretty common.
All the b/g twins I know who are my boys' age (5) are pretty tightly bonded (even though they can get antagonistic). My boys are very very close now, but I didn't think they would ever be when they were babies. (though both of them retain their tight bond with their sister)
So I would say that you're not alone, and that even though it's kind of a bummer sometimes and perhaps not exactly what you think "should" be...don't be too quick to judge. They're babies. Wait until they are ready to tell each other in words what they feel (when you can listen in on the monitor), defend each other on the playground, ect. When my boys were babies primarily they saw each other as a squirm lump of flesh that felt mighty good to teeth on and oooh, it even makes funny noises when I gum it!