Agree with all the comments and coping strategies here. The wait staff at WDW is amazing with solo diners, and will do their best to make you comfortable.
Just want to add one little strange thing that happened to me while dining solo at Tiffins in the AK. It involved having to visit the restroom between the entree and dessert. General etiquette tells you to leave your napkin on your seat to indicate that you will be returning, but I hate doing that! I really don’t want my napkin resting on a surface where who-knows-how-many-backsides, which have been sitting who-knows-where, have also rested. In a theme park that is just yucky. So I left my napkin, along with my hat, sitting on the tabletop next to my place setting - thinking that would make it obvious that I hadn’t left the restaurant.
Well, in the three minutes I was gone, a couple at a nearby table assumed that I had indeed left and told the server so. So my hat was taken to the host stand. Thankfuly when I returned, they had the good grace to tell me what they had done and apologize! I was a bit mortified that a.) someone had thought I’d dined-and-dashed, and b.) my hat was in bad shape due to it being very hot that day and it had sweat and makeup on the inside brim. I was more embarrassed by the state of my hat than by their mistake. So I sheepishly retrieved the hat, my server acted as if nothing had happened, and I enjoyed my dessert, lol!
I guess the moral of that story is that it might be smart to carry a little card or sign to leave at your table if you have to get up for any reason. Apparently people can forget that solo diners need to use the restroom too, lol.