Ugh, I did this from the age of 7 up, I feel your pain. Various reasons I won't get into. But the only thing that has improved my situation has been medication. Even now, I fight being knocked out by the meds, and if it wasn't for the meds I wouldn't sleep at all. I have done some pretty nutty things fighting my medication, and even heavily sedated I fight sleeping. It's so habitual and ingrained that I couldn't function without it, I literally have to be knocked out in order to sleep. I just need to learn to stay down :P

Something you could try is to get into relaxation mode in your bed and bedroom during your waking hours. Listen to some relaxing music, read a book, do deep breathing. Make the area pleasant, make it feel like "Yours". Bring things into your bed to work on, like sorting something. Re-tune your mind to the place being something you are in control of.

If you have a friend or someone you feel comfortable with, try hanging out in your room a bit with them. Hard to explain, but I feel like bringing someone into a place that has a negative feeling in my mind kind of "breaks the spell", so to speak. It forces my brain to look at the space in a different way when there is another person in it, interacting, and having a positive experience.

Best of luck, I had difficulty living on my own at first as well, and I'm sure it's going to get better. It sounds like you are happy with where you are living, so it will come.