Do we have false memories?

The fact that Rachel is really the only replicant that can feel fear and love raises some questions. It questions what it really means to be human. Rachel was unaware she wasn't a human until Rick told her. She had memories from when she was a little girl because her creator integrate false memories into her that she thought were hers, but were really a humans actual memories. These memories and since she has been around humans her whole life most likely are the cause for her ability to feel for others or to become scared. This questions what it really means to be able to get scared or love someone else. How do we know if these are real feelings or just something we perceive to be real because we trick ourselves into thinking they are real. We grew up being taught that these feelings are real so our brains trigger when we believe we should love someone else or we should be scared. So our we actually loving someone or are they based on false feelings like the false memories Rachel has integrated into her? It's a hard question to process, but this can go back to questioning what humanity really is. Rachel always thought she was a human, but she has always been a replicant. All of us as humans could be something different such as a replicant, but maybe never know just as Rachel didn't know. We could have been placed in this world or created in this world and have been given false memories, a fake planet created for us, a fake history so we don't question who we are or what we are. We could be a giant experiment or simulation created by a higher civilization or alien form from another galaxy. They could be watching over us to see how long it takes for us to destroy our planet or to see if we can get off of Earth before it's too late. There is no way of knowing this is happening, but the question is raised from the fact Rachel never knew she was not a human.