This won't help you directly at this stage from what you've said, so for reference only:
Accessing Safe Mode in Win 10 is not by hitting F8 on boot by default. (My boot time to the lock screen is around 13s - no time). You access Safe Mode typically by SHIFT + Restart and navigating thru a sequence of prompts, or by booting from Win 10 install medium, and via Repair thrua similar sequence of prompts.
kung wala talaga format mo na lang, back up mo na lang yung mga files mo, kung hindi mo na maboot windows mo gamit ka ng live linux os para makuha mo pa mga files mo,