I'd worry less about an aneurysm and more about axiety. You have no symptoms and no family history and no risk factors. The thing you should really be addressing is being a 21 yr old who is obsessing over conditions he/she doesn't have. Get the anxiety addressed or you'll waste time, ruin relationships and make yourself sick over irrational fears and worry.
Omfg same. Same. Its like i wrote it. Just get a brqin scan once a year and you can detect it.