Macbook Pro Won't Boot in Safe Mode...it also won't stop trying to boot in safe mode

I was having an issue with Finder crashing on my Macbook Pro.  After startup Finder would give me the spinning wheel of death if I clicked "about this Mac."  To try to resolve this issue, I attempted to boot in Safe Mode, but it basically died each time when the progress bar reached around 20%.  I was able to get into the Disk Utility and attempt to repair, but I learned that I need to back up and restore.  (I tried this twice.)  However, my machine will now only attempt to boot in Safe Mode (at which point it reverts to dying at around 20%).  How can I back up my machine if I can't boot into either safe mode or regular mode?
(P.S., If you can't tell, I'm not hyper computer literate, so simple explanations will be most helpful.  Thanks!)

dullman82,
as you’ve discovered, the option to back up is currently unavailable to you with your disk in its current condition. You can try these two possibilities:
Install OS X onto an external disk, boot from your external disk, run Software Update to get it up-to-date in its version, and try backing up your internal disk when booted from your external disk;
Boot into Recovery mode, and select Reïnstall Mac OS X to reïnstall OS X on your internal disk (which should leave your other files there untouched) to see if that will fix your Finder problem.

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    https://support.apple.com/kb/TS1367
    Assume you know what your OS, how to use the Recovery Mode, and how to repair or do Safe boot and other tasks.
    General purpose Mac troubleshooting guide: Isolating issues in Mac OS X
    Creating a temporary user to isolate user-specific problems: Isolating an issue by using another user account
    Identifying resource hogs and other tips: Using Activity Monitor to read System Memory and determine how much RAM is being used
    Starting the computer in "safe mode": Mac OS X: What is Safe Boot, Safe Mode?
    To identify potential hardware problems: Apple Hardware Test
    General Mac maintenance: Tips to keep your Mac in top form
    MacBook Pro
    https://discussions.apple.com/community/notebooks/macbook_pro 
    https://discussions.apple.com/community/mac_os?view=discussions
    http://www.apple.com/support/macbookpro

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