The only advice that will work for u is just do it

In my experience the best thing to do is to have a friend who had a wide social circle and who can do what ever he/she wants with full confidence then you will afopt their behavior

trying something that would boost your confidence.. for example: try working out and be in casual public spaces (specially where ppl talk/meet freely like cafe) and observe/learn from their interactions these are based on my experience and may/may not work for everyone (but I think it most probably would) Good luck

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