Is it normal to hear voices? But not see anyone?
No. Talk to someone about this, face to face. A parent, teacher, pastor, counselor, someone of that nature. It's probably nothing serious, but then again . . . talk to someone about it.
sounds like a demonic presence...do the voices freak you out, and make you fearful, or do you feel a sense of peace when you hear them? What are the voices saying?
You have just stepped into a larger world.Before you say any thing to any one.Do some research your self on the subject ofparanormal. You might find as many have thatit is the old normal.
If you're actually being serious ... schizophrenia usually manifests in the late teens and early twenties. You might want to look it up on webmd or similar.
Sounds normal for blind people or crazy people
It's not normal , I suggest you speak to someone about this problem . There are many reasons you may be experiencing this , which needs to be and reseed by a professional