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You can't. But if you've discussed your memories with someone who was there, multiple times, and there isn't much conflicting information, then you can be pretty sure they're accurate.1
You can't. They get manipulated or change very fast without you even noticing it. The only thing you can do is document your life like some of those life bloggers and write detailed diaries
There's really no way to confirm it unless you talk to people involved in the memory and they remember the same exact thing.
You don't? Mine are usually highly accurate though luckily haha.
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