How can I get better at picking up on people's subtext in a conversation?

I wasn't really allowed to socialize until I was 9 and literally just realised this is a problem I have.

Finding out how to be a normal part of society is really hard for me and it has required a lot of blood sweat tears and rejection. So please don't be afraid of being blunt.

How can I get better at picking up on people's subtext in a conversation?
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