"The most important thing in the world." Whatever you are doing that's how you should approach what you are doing. Right? Even if you know what you are doing isn't the most important thing in the world. Or probably not. Right?
You are this little being. In the world. It's a big rollicking, raucous place. Most of the world, and the beings in it, don't even know you exist. This shouldn't really bother you. As Jerry Seinfeld reminds us, being a drop in the ocean is just fine.
So yes, maybe just a tiny drop. But your drop-ness is pretty damn unique. It's all you got, so you should just go with it. Give it your all. Make your own existence important, and the things you do, what you choose to do, and choose not to do - important. Yes, important. The most important thing in the world… as if...