Are we all separate souls/separate identities?

I don’t know if it’s a valid concern or I’m just having an identity crisis due to childhood trauma, but I’m afraid that after death I’ll realize I’m the same soul as someone I used to be friends with because we had the same traumatic experiences, same interests and same mental struggles. I don’t want that and I want to be myself. I don’t know why I’m spiraling almost every month being afraid I’m actually someone else. When I notice I have similar habit or facial expression or personality trait as someone else I’m starting panic that I’m actually them and me as separate soul doesn’t exist.

Are we all ourselves? Even the most average people on earth all have INDIVIDUAL SOULS? Like there’s no way someone else and me will become one consciousness after death? This is my worst nightmare, not being myself. No new age beliefs “we’re all one” since it’s not entirely true please! ❤️ Thank you!!