I Am Alone On Valentine's Day

There is, but I think that's when it hits home, since Christmas is considered a family holiday, Valentine's Day a "romantic" one. The rest of the year people do those other things that life involves.

they get sad because it's a reminder that they're alone when they don't want to be

There's far more to life than dating, sure, but know what goes real well with those other things in life...?
Companionship.

As one that is used 2 bein a loner, I still love these holidays cuz I always treat myself!! Yes i know im pathetic lol😉

"More to life" is a phrase that reeks of self-congratulatory bullshit.