I'd say yes, you are an outlier. Most people have some measure of social anxiety -- "do they actually like me or am I just convenient and useful to hang out with" etc. Seems to be very common sentiment.

You are an outlier but you shouldn't be.

I mean, describing it as providing "a service that people enjoy" is probably the weirdest bit. We've got to remember that the outspoken ones, at least on areas outside of major social media, are nerdy introverts for the most part. There are people that are 'chameleons,' where they have a group of tennis friends (I probably need to update that description to the more popular pickleball, now...), a group of mall-shopping friends, a group of partying friends, and it's possible that it isn't always the case, but almost always 'never the [thrain] shall meet.' The various groups would probably not have much in common. The nerdy introverts, though? They're the opposite, where their small, core group of friends are likely all similar and share a lot of activities together.

You can imagine that the majority of ttrpg groups fit the second group more than the first. Not all of them, but most.

You sound like you are a rare and special creature known as a GM-by-choice. Many GMs are would-be players stuck in the GM seat by circumstances, or would-be writers who misunderstood the role before taking it. Plenty of people don't even get that the GM is essentially playing a different game from the rest of the people at the table.

Congrats on finding your niche.