No reason to be disappointed in yourself. You gave up on what was really a lost cause. The eggs were so extremely unlikely to develop, let alone hatch, and you'd have been stressed out every single day over them.
One was broken, there was nothing there but undeveloped egg, and you knew when to quit. Knowing when to quit, is a valuable skill, believe it or not! It's a sign you might not spend your whole life beating dead horses, or tilting at windmills.
Tilting, if you're not familiar with it, is another word for jousting, like the medieval knights, on horses, huge wooden lances and all of that. Imagine jousting against one of those huge stone windmills like they have in Holland. You see the futility of that, I'm sure.
In other words, it's more productive to spend your time and energy doing things that have some chance of success. There's value in attempting difficult projects, (like developing a new breed of chicken, or garden plant maybe) but usually not so much in doing things in the most difficult, least-likely-to-work manner you can find.
Don't kick yourself, you're doing fine.
