Soteriophobia - Fear of being dependent on others.
When I was younger, I had friends whom I thought I could lean on when I got in trouble. They left me on my own when I couldn't give them anything in return. That was when I realized that I could only rely on myself if no one was there to save or protect me.
Nyctophobia - Fear of darkness.
The thing about total darkness is that I can't see whatever scary thing will appear. I sleep with the night light on, but luckily, I don't need it because there's a little light coming through my top bedroom window thanks to the lamppost.