Why was the fellowship scared of entering Lothlórien?

I’ve read the books once and movies many times. But I still have this burning question.

After leaving Moria, the company entered the golden woods, and they were a bit reluctant of being there, specially Gimli.

Presumably Aragorn and Legolas would’ve already been very familiar with the golden woods, so they wouldn’t be afraid of being there. And they’d have obviously communicated with the company before entering the woods that they’ll be entering an allied land and meeting Galadriel. Gimli or anyone wouldn’t just be going on thinking the lady of the forest is a cunning evil witch and no one makes it out the forest alive.

Can someone more learned than me please shed light on this topic? Thank you.