How can I stop regretting small and big decisions?”

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To give you an example: today a friend invited me to go tomorrow to a church activity. At first I hesitated, since I know that’s not really my world, but I accepted because I didn’t have anything better to do tomorrow morning. And well, I did get a little excited. Now, thinking about it more, maybe it’s silly, and after reflecting I’m starting to regret it a bit: “It’s more comfortable to stay home playing,” “That’s not your world and you’ll feel uncomfortable,” and things like that. This happens to me about 90% of the time—I regret it right after accepting to go to a party or something, or I struggle a lot to make a decision. How do I fix this? thanks and sorry bad english