How can some of my closest friends have the power to make me feel so ugly?

In the midst of many overlapping conversations, I notice.

Several of my closest friends surround me, yet there is an atmosphere quite distinct from the one that I have known for years.

All laughter and smiles remain after a seemingly ordinary get together. With the addition of company, however, the unfamiliarity becomes accentuated when I notice exactly what was different. 

As my eyes scan the circle of people in which I am standing, I realize that I am alone. That each of my friends stand happily beside their significant other, and here I am companionless; feeling a sense of detachment from each of my best friends. 

The feeling of disconnection is not due to my lack of a partner, but due to the subconscious condescension that radiates from their gazes and presents itself with their actions. Though they don’t mean to do so, they inflict a sense of pity towards me, and that is what makes me feel so little. That is what makes me feel so alone. 

Feeling completely alienated in a room filled with my closest friends, is something I never imagined I’d experience. The worst of it though? It’s the fact that they are not even making me feel this way on purpose. What can I really be upset about?