I'm scared of being home alone. Being at home period sometimes, but never other places if I'm with someone.?

Ever since I can remember I've been afraid of the dark. My mother was a stay at home mom so I was never home alone, and she has always been very precautions. She always made sure to lock up the house a million different ways and no doors were ever unlocked. She always told me to keep the windows covered at night because people want what they see, and she would always tell me about how I should be extra careful. So when I got to be 11, 12, 13, my mom started leaving me home alone a little bit. And at first it was cool, freedom ect., but after a bit, idk exactly when it started happening or why I began to get really anxious. I have always slept with the door open and with the light in the hallway on, and when I was about 12 when I got my first tv in my room, I started watching tv and falling asleep with it on, then eventually I had to sleep with the hall light on, my room light on, and the tv and fan on to get to sleep, plus I had to sleep farthest away from the door, not face the door, and have my feet and my neck at least covered with a blanket. At one point it became to stressful and I began to sleep with my mother in her room. After a year I got up enough courage to face my fears and pretend that nothing was wrong. I still had to sleep with the hall light and the tv on, and i needed my feet at neck covered, sleeping farthest from the door. But eventually I concurred my fears enough so I wouldn't be terrified. The past year it has heightened again, but now it's a bit different. I work graveyard at a Denny's so when I come home and leave home it's really dark. I live at an end of a street and my backyard is against an open field. I live in suburban california. So I get really paranoid that someone is going to jump out and get me at night, I have pepper spray, but sometimes I have to force myself to get out of the car and open my garage. I'm afraid of exiting rooms at night when I have to turn off the lights and when I'm home alone I have to turn on all the lights in the house and all the tv's. Lately when I wake up and my mom's not home cause she's working, it'll be like 10am, I'll get so paranoid that someone's in the house I have to get in my car and leave. My fears seemed to be more heightened in my own house then in other's. I'm 18 now, my boyfriend sometimes spends the night and I can fall asleep easily-er, but my tv has to be on and the door can be closed. No matter what all the doors in the hallway have to be closed and my closet door has to be closed all the way too. If I wake up in the middle of the night(my tv has a timer so it turns off when I set it to) and it's dark I won't be able to get back to sleep - my remote can't turn on the tv, so I have to get up and do it myself - so I cover my entire body with my blanket and I become stone still, I have to force myself after about an hour to get up and turn on the tv. I'm tired of being so scared of the dark and being alone, I'm tired of being scared that in the corner of my eye their is someone watching me, and I'm tired of always having to watch my back when I'm in my own home. I KNOW that their is no one their and I am safe, but I just can't get over this fear. I'm not sure what to do.