I look to my cats every time I hear a scary noise in my house
Do you look at your cats because they are making the noise?
The noises are coming from me living in an old house
If you're the one making the noises, then you might be scaring the cats.  But if not, it's good to have another living being to confide with when actual scary things happen, the both of you can keep each other company.
I'm not scared but maybe I should be because, sometimes the noises might not be me.
Most noises in old houses are just naturally occurring things such as wind or pipes heating up, so they're nothing to be scared of.  Your cats are probably used to these noises, but in general, you should try to avoid aggravating your pets with needless noise.  Try to move carefully, and wear slippers instead of heavy shoes at home.