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As I was hiding in the dark, tiny room, which I could barely fit in, I bumped into something which made a loud noise.

1) Is "bumped into something" fitting here even though "I" doesn't move much or is it too forceful-sounding?

2) Is the sentence grammatical?

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anonymous1) Is "bumped into something" fitting here even though "I" doesn't move much or is it too forceful-sounding?

It sounds OK to me.

anonymous2) Is the sentence grammatical?

Yes. I'd leave out the comma before 'which', but you don't have to.

CJ