Why does it always end up like this? Am I justified or am I being a fool?

Talked for two days and got along great then she brought up Dropbox for me to send my pics to. I’d already sent her multiple, she sent me one of her face and at this point I asked for a little more verification. Why does looking for this dynamic always end this way? It feels like no one is real but maybe I’m wrong and I just fumbled? Idk what to think anymore. I hate this feeling. Opinions on this?