I sometimes get scared that everyone in my life has been replaced with someone who acts, looks and does everything like them.
Is there something specific that makes you feel like that?
Things just don't seem real sometimes.
That's an understandable feeling, but it can also be a symptom of a larger mental issue. Maybe you can talk to a professional about it?
It's useless to think this way.
It's nothing you have to be ashamed about, but you should get professional help if you're feeling dissociative feelings. It can cause problems for you and slowly get worse.