Confused

Okay I don't think this counts as a personality disorder but I don't know what else to call it sometimes I feel like there are two people living inside of me on every social media platform where I talk to people over the internet I go buy potato but my name is Sarah I like being potato more than I like being Sarah sometimes I feel like potato is confident potato is funny people like potato but when I'm feeling down and insecure and nervous I feel like Sarah sometimes it genuinely feels like I'm switching something I don't know what to do with this if I'm in a situation sometimes I think about how potatoes would act in a situation versus how Sarah would act in a situation and they're usually different and to be honest it's really hard to explain this is the best I can do

Anybody got any ideas on this?