Are there any creatures that eat, or drain a human's life force? Have tried googling but am not sure which creatures do.
"Life force" is a rather vague criterium. Many mythologies do not have this concept. The only ones I'm aware of outside of Abrahamic mythology are Eastern mythologies:
There are no myths about creatures consuming Prana or Qi.
Judaism, Christianity & Islam: Incubi & Succubi
Said to eat the life force of those they seduce. In some myth variations, incubi & succubi are said to eat the souls of those they seduce.
If you extend the scope to include various concepts of "soul", there are a few other ones:
Ancient Egypt: Ammit the devourer
Africa: Soul Eater A soul eater is a folklore figure in the traditional belief systems of some African peoples, notably the Hausa people of Nigeria and Niger.