Indeed, telling us what camera you are using would be very helpful. (it's been asked half a dozen times... )

But that's you're problem in general, your pictures are severely underexposed. Try 400 for inside, but even that might give you kinda dark photos.

The lomo type cameras have very slow lenses, probably like f/8-f/11 I'm guessing?

You'll have much better success by using that camera outside, in which case the 100 will probably suit you well, but 400 in anything but direct sunlight will probably work ok too.