Hello Interloper!
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Botox will not make you look unnatural. It is possible to overdo Botox, but this would just result in an overly frozen appearance and not any sort of unnaturalness. The idea that Botox makes you look frozen is a myth, as the effect is actually very subtle and natural looking.
In terms of looking like a different person, the only way someone could tell is if they had seen you before getting Botox and then saw you again after it was injected—and even then it's hard to say if what they saw was really an undeniable difference or just something they "think" they see because they were told by someone else (or read on the internet) that there should be one! This can lead people into believing that their loved ones will suddenly transform completely once they start getting injections regularly—but there's no reason why this would happen unless those loved ones had already been anticipating such a drastic change beforehand... which seems unlikely given how subtle the effects are overall!
The same applies to age: If friends start noticing that everyone around them seems younger than usual (and therefore assume it must be due to something going on inside), maybe we need more Botox ourselves? No one can see themselves getting older in real-time anyway... so why worry about what other people might think?