Noob question - I keep respawning in group of enemies and die instantly

I am brand new to this game - enjoyed the TV show and it was on offer. I have just started playing the main game and am trying to clear raiders out of the Corvega Assembly Plant. But I got swarmed and died by a group of raiders. So I respawn surrounded for four of them and I die approximately 1.5 seconds later. I am stuck in a perpetual death loop, with no means of escape. What can I do? Is there I a way I can quit and go back to an earlier save or something?