Been there, done it and got the postcard on numerous occasions.
I've a box full of connectors and loads of tubing and hose of various sizes and lengths all due to buying the wrong size and I've also sometimes felt like tearing my hair out because I've got every size except the one I need or I end up one connector short or something like that.
Worse than that is when I've worked out I can do things a different way with different size hose to find out I'm still one connector short.
I really pleased you posted that because I thought it was just me.