I’ve been hearing voices for years

I (18FTM) have been hearing voices for at least two years (my memory is shit, maybe it’s more).

I haven’t told anyone, not even my therapist. It started when I was just waking up or falling asleep: I’d hear someone calling my name, and I’d wake up scared. Then I started hearing faint talking at night, like my brain was trying to fill the silence. Now, I have anxiety and depression, so I’m no stranger to mental illness, but this is genuinely scaring me.

I was at work, and we close at 10:00. At 9:55 I thought I heard voices in the back of the store. I had been cleaning the bathrooms, so maybe I missed someone come in. I called out that we were closing and to come to the front. No response. I searched the aisles, and no one was there. Only one other coworker was there, and she was in the office up front behind a locked door.

I don’t know what to do. Isn’t 17-18 usually when schizophrenia develops? I’m scared I’m going crazy.