I start searching for the last cat of the wastes, and when I find it? I'm gonna eat it.
Anyway, I'd probably be really annoyed then find shelter, a weapon, a water supply, some food and then wait.
I'd wait a couple of days and just keep a lookout to scan the area of what is around me, if there are radscorpions then I high-tail it out of there, if there's deathclaws then I sneak outta there, anything dangerous and I get out of there.
If it's cool then I try to move to the outskirts of my area and look for people in a certain radius, if I can't find any then I return back and try to figure out a way to hunt animals for food.
If I see people then I try to determine by their clothing, weapons and amount if they're raiders or not, if they're not then I might move forward and ask them for direction to a town.
If they are raiders then I wait for the right moment to murder them all, then I take their stuff and set out their bodies as bait for other creatures.
If I find my way to a town I'd try to find a job as a caravan guard or scavenger and make a living.
After a year or so of earning money and gathering intel about the surrounding towns/cities I'd move to the most secure one and find a new job there, most likely as a town guard so I can get on the good side of the law enforcement, then I'd live out a boring uneventful life fighting petty crime and the occasional raider attack.
Yay for me!