Don’t get attached to code. The next release of the codebase might strip all of your code. Just let it go. The experience and the learning is not just the code accumulated on GitHub, it is the process and the choices and decisions.
This is just like Buddhist mandalas. Monks painstakingly take enormous amounts of time to build the beautiful, intricate mandalas, and then they just brush it away. It is the skill and the patience and the focus that matters, not the end result.