I'm terrified that if I am left alone I am going to end up dead.
This sounds serious. What's making you feel this way and are you thinking of hurting yourself?
No, I'm not going to hurt myself. I'm just afraid of being alone. It terrifies me.
It's normal to feel like being alone can be scary but it's also something most people work through and get comfortable with. There is literally nothing that can hurt you if you are alone so you shouldn't be afraid of dying. If you still can't get comfortable with it then you should consider getting some help.
I'm scared. I'm going to ignore everything you just said.
I understand it can be difficult to seek help from a mental health expert, but you need to if you have these feelings when you are alone. If you talk to them, they can help you feel better and teach you how to feel safe when you are alone.