Why the Inability to develop lasting connection?

I don't necessarily mean romantic relationships, it even applies to friendships. I can't really let people in cause I don't really find the ones around commonsensical enough most of the times and the ones I admire or appreciate are mostly quiet. Since I'm not a great talker either and since they might find me a wee below their league, I have trouble approaching them. How to develop lasting connections?
Why the Inability to develop lasting connection?
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