Like what? I believe that I'm an incidentally self-aware thermodynamic curiosity; setting any sort of lifelong goal feels like an attempt to fool myself into feeling important.
This line of reasoning feels like it's missing an important piece. If you consider yourself to be unimportant, then why is vanity a bad thing? It won't matter either way, except that you may feel better and be more active.
Ah, but feelings of importance are merely incidental mental representations and emotional responses that are somewhat hard coded into our bio machinery, so I'm pretty sure the universe won't mind if you indulge every now and then. Having this self awareness adds a nice element of comic absurdity to the indulgence as well ;)