Lonely at work!

Walked to the canteen to get my lunch today and asked them to put it in a box to take with me. So continues another day of lunch at my desk. This is the third company I've worked for, since I had to leave grad school (they call it graduation!), and at the first two places, I made friends from the girls/guys around me within the first week itself. So lunch was a social affair where I could relax during a day of work and enjoy some good-natured banter along with the requisite tuna sandwich. At this new place, however, its been two months and even though I've made friends, the prevalent tone during lunch is, "am busy/having a meeting/have to get a presentation made, etc., having lunch at my desk". For those annoying readers who think I might be a pest and am being avoided by these people, YOU'RE WRONG! They really do have lunch at their desk. go figure!
I'm missing the camaraderie, the banter, the "friends" you can make just by sharing a meal together a few days a week. This is a large facility, and there are tons of lunch partners everywhere, people I see in the canteen on a semi-regular basis, who sit together, laugh/smile, eat and seem to repeat the experience every day, except not with me. Walking up to some of these people and asking to join them seems like a good idea when I'm heading out, but once there, the coccoon of familiarity all of them enclose themselves in, seems difficult to breach. There's also the social inertia and the personal fear of being considered a loser. So I haven't brought myself to take that step yet.
Every day noon rolls around, and I dread having to make the solitary walk to the canteen, grab a box and ask for my food "to go". Sigh!