I know how you feel. I tend to think like everything I do is insignificant and not worth sharing. As a hobbyist programmer I only work on things in my free time. I used to not publish stuff on GitHub because I felt my projects were incomplete, too small, too unpolished, too unmaintained. I've never submitted my projects here and only mention them in comments when they're relevant and posting them is easier than explaining. I started making a deliberate effort to change that in the past few years. I've repeatedly discovered that people notice what you do when you put yourself out there.

Years ago I bought a Clevo-based laptop from a brazilian manufacturer, reverse engineered the keyboard LEDs and wrote a Linux user space driver for it. I just published it on GitHub and forgot about it, assuming no one would ever care. One day I opened my email and discovered I somehow had users and someone even built a GUI around my little program. I was actually a little embarrassed that someone had posted an issue asking me how to use the thing and I didn't even see it.

I mentioned another Linux project here in comments, someone submitted it and I got to engage with the community about it. Recently someone submitted another project of mine, a programming language, without me talking about it. Seriously made my day when I opened HN and saw my project on the front page. Couldn't even believe it at first.

It takes a certain boldness to put oneself out there. I'm always ready for negativity and criticism. Still, the results can be very nice.