I don't hear my alters, at all ever. Like it is totally quiet in my head all the time and I'm scared I'm fake. Is this normal?
The amount of communication really depends on the system, but the frequency with which you communicate with your alters is not really part of diagnosis and shouldn’t invalidate your having DID.
Alters can go dormant for weeks at a time, months, occasionally even for years. There could be internal communication going on that you’re not connected to (ie, the host being locked out of the headspace). It could be that communication is more subtle than that (I tend to “talk to myself” aloud when I’m alone a lot of the time). Only about a third of people with DID hear voices- communication via thoughts that feel somewhat distinctly “not yours” is a common form of communication.
DID is complicated. It’s messy and different for everyone and confusing. If you’ve recently realized you have this (within the past few years) then you might not be in tune with what’s going on and are missing the bulk of the communication. Trauma therapy will help with this and help your system to open up. DID has a weird tendency to hide itself so you can function as best you can when you’re younger/in bad situations, so if either of those apply your system might be in a resting state until you’re safer. Communication is complex and changes with DID take a long time, it’s slow going. Let’s be patient with this and see how it develops, but again frequently of communication doesn’t invalidate you.