You don’t have to cut yourself off from expectations, you just also don’t have to expect perfection and punish yourself for anything less
Okay, you had a plan. And your creation doesn’t match it. Your imagination doesn’t have to deal with physical dimensions and the limitations of hands, though, so you probably got pretty close within reason and you definitely got WAY closer than if you didn’t start.
Of course you expect something but it’s up to you what those expectations are.
You expected to create something perfect and you didn’t,
You expected to create something enjoyable and worth spending time on and you did.