I would not worry about that. I've rarely felt any sort of awkwardness as a solo on an
ABD. For the most part, people are very accepting and inclusive of solos. The Adventure Guides really work to make sure everyone is included. I've done 10 ABDs as a solo, and only felt awkward a couple of times (and that would be isolated times during a trip, not the entire trip.) Mostly it's around OYO meals, where folks just seem to all already have other plans. But I have no problems eating by myself, so it's really not a problem!
Sayhello