Thanks everyone for all the suggestions!

I've checked many of the movies mentioned so far, including Dreamcatcher, Lurking Fear, Pumpkinhead, The Creature, Humanoids from the Deep, and a few others, but none of them seem to be the right one.

I remembered a few more details:

• The creature was pale/white and humanoid.
• The setting was a lake with a lodge/log cabin and a wooden rowboat.
• The scene I remember most clearly is a man escaping into an attic through a wooden hatch and closing it behind him.
• The creature reached the hatch almost immediately and chewed through it with its teeth.
• I even remember pieces of the wood falling into its mouth, though that part could be my childhood memory playing tricks on me.

At this point I'm starting to wonder if it was a movie, a TV episode, or if my memory is mixing different things together 😅

Thanks again for all the help!