they say that the sense of 'deja-vu' you get is your brain incorrectly writing 'timestamps' relating to memories. so, theres a valid scientific reason why we get those feelings.
yes, when i was around 18-20 i had very strong deja vu all the time where i knew what would happen next, like I've lived it before. down to knowing the exact words/tone people were about to say, things they'd end up doing, etc.
now, I'll get that same feeling but it doesn't result in correct predictions anymore. no idea why it used to, but it was always weird.
I would hypothesize that people would start with strong psychic abilities in early stages of their life, but the longer we live the more these abilities dull or become loss all together. Not because of old age, but because the accumulated disruptions to our minds with passage of time (radio waves, internet, brainwash media, indoctrinations, etc). We are constantly bombarded with psychic disruptions passing through as well as being reprogrammed to lose our abilities through brainwashing and indoctrination. We are made to conform to arbitrary societal constructs that work against us without realizing it.
I imagine there are very few truly unique experiences in this life and that someone has likely been through exactly what you're going through in a different time and place.