I am attempting to be... diplomatic. While I sympathize with you returning to your childhood home after being on your own, this is their house! We tried living with my parents for the 6 weeks it was going to take for the house we were moving into to be ready. We didn't make it the 6 weeks.

All of our children will always be welcome in our home. I would not dream of asking them to pay rent while living here, but there is a cost, and that cost is respect. This is MY house. I paid for it, it belongs to me. I have earned the right to live the way I see fit. By the same token, when I visit my adult children I follow their house rules as well.

I smiled when you said you flipped out about the books. While I would never openly disrespect my own mother in that way, my brother and I feel similarly about my mother's Hummel and Angel collections. She brings all of that crap in the house and sees beauty. We see a bunch of crap that someone's got to sort through when she's gone. She has filled 3 bedrooms, a basement, attic, two car garage with a full attic full of this very expensive junk. While her bedroom, bathroom, living room, den, kitchen, dining room and office are all very "normal" at least 60% of her house and all of her 1500 (not including the attic) sq ft garage is filled with what we consider junk. But it's her house and her money.

So my suggestion is to keep your bedroom the way you like it and give your parents the respect they deserve and accept the things you cannot change.