Why is making real friends as an adult so difficult?

I've been trying to invite all my acquaintances to come to the bar with me, join sport clubs, dating events. but no one wants to come with me. Some of them say they are interested and will reach out later to schedule a time but they never do. I just dont get it. It just feels like people just dont want to connect. have you had this experience?

Why is making real friends as an adult so difficult?
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