I used to do this too! It would be hard to find someone bigger than me, and if they were, they were immobile most of the time. I'd see people on electric scooters in the grocery store or something of that nature. Most of them were older as well, not in their 20's like me.
Now, I look at people and wonder do I look like her? Am I bigger, smaller? I compare myself to people I know, and ask my husband, Am I smaller than her now? It sounds soooo vain. And i guess partially it is. I'm so used to being the biggest in the room, but I don't think its that way anymore. Every time I see someone larger, I think to myself, have they considered WLS? Do they know how different it could be? And I know that it's not always a good option for all, but I can't help that my mind wanders there.