I can guarantee you that if you were to write a completely new program and continued to work on it for more than 5 years, you'd feel the same things about your own code eventually. It's just unavoidable at some point. The only thing left then is degrees badness. And nothing is more humbling than realizing that the only person that got you there is yourself.

No, I wouldn't. I have been working for years on the same codebase, it's not that hard to keep it clean and simple. I just refactor/redesign when necessary instead of adding hacky workarounds on top of hacky workarounds for years until the codebase is nothing but a collection of workarounds.

And most importantly I just design it well from the start, it's not that hard to do. At least for me.

Of course we all make mistake, there's bugs in my code too. I have made choices I regret. But not on the level that I'm talking about.

I can guarantee you that I have been doing just that for 20 years, creating and working on the same codebase, and that it only got better with time (cleaner code and more robust execution), though more complex because the domain itself did. We would have been stuck in the accidental complexity of messy hacks and their buggy side effects if we had not continuously adapted and improved things.