Taking all your stuff with you to bathroom and not having any room to open or close the door.
Falling asleep on the plane and waking yourself up with your snoring. #whoops #notembarrassingatall
Groups of people traveling together. Like a whole big group of teenage boys on an early morning flight, who make teenage boy style jokes really loudly, and also smell like teenage boys. Or the group of like, twenty, who don't all arrive to security together, but budge in front of people in the security and boarding lines because "oh hey, yeah, I know you planned ahead better and got here earlier than I did, but I'm with them, up there, so I'm just gonna cut in front of you." (Yes, that has actually happened to me. More than once.)
Having no control over who sits by you. When you are traveling with someone, yes, one of you may have to share a side with a stranger, but at least you and your companion can keep each other company. When you're on your own, you have no such luxury.
Really slow people in security lines. I am one of those who is always prepared for the security lines. I plan ahead, make sure my 3-1-1 bag and computer are easily accessible, wear easy to divest sweaters/jackets, and always wear sneakers in airports. I can whip through a security line in like, no time flat. And yet I seem to always end up stuck behind people who somehow manage to forget they have to take stuff out of their bags, they can't have metal in their pockets, they can't wear shoes, etc.
Having to be really close to people. I don't really like people as a rule (Steph's "10 Best" posts are some of my favorites) so having to spend hours literally inches away from bunches of them does not do anything to lower my blood pressure.
Trying to get something to eat in airports. The space is always so limited, and it never fails that I either run into someone, or run over their toes while I'm trying to juggle my suitcase and purse and everything else, and that just always makes me feel bad. Plus, everything is ridiculously, stupidly overpriced. Paying $4.50 for a bottle of water is just dumb.
What do you love or hate about traveling alone?