unable to let go of stuff...can you?

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have you ever heard about people or maybe you feel like that yourself. People that are like unable to let go, like when there's a party, music etc. u wanna dance, u wanna disconnect and just enjoy it and sing along to a song, but u cant, like something is blocking you and its not shyness, just this feeling like you want to but you just cant or feel like you shouldnt? I get this feeling all the time and its sooo annoying, im fun and all, joking around and everything, but I cant let go like thhat when all my friends can goof around and stuff i just cant. And I'm not really very shy unless i like really get into deep conversation about something. so anyone experiencing same, how do you cope with it?