Hey guys!  Recently my(26) half sister sister (36)  let me stay with her and her husband and two sons (5, 12) because I was having issues with my boyfriend and his mom. I wasn't raised with my sister, we grew up in separate foster homes so we aren't super close. I was surprised she invited me to live with her especially after I raised concerns about me living with kids. I'm diagnosed as bipolar II and I was worried about my mental stability around children. She said her kids are usually busy she has a large house and no one would bother me and she really wanted me to come.  This was slightly before Xmas and she invited our mom to stay with her for the holidays. I haven't talked  to our mother in over 5 years because her new husband used to secretly film me in the bathroom when I was a child. I told my mother about this before I left for college and showed her the grocery bag full of DVDs he made and she wasn't surprised because she knew had a sex addiction (I had no clue about). I stopped talking to her because she wanted me to thank this man for money they were sending me during college I refused and told them don't send me shit anymore. I dropped out of school beginning of sophomore year shortly after being diagnosed as bipolar and have been supporting myself ever since. 

I had no issue with our mom coming by for the holidays but I did not want to be there. My sister said our mom would only be there a day or so and I could hide in my room but I decided to go visit my boyfriend until the new year. I could tell this upset my sister but I got every one small gifts for the holidays so they knew I was thinking of them but I needed to take care of me. I return and everyone including the kids are being super cold to me. I would be starting CNA school soon so I just hid away in my room. I came back on Tuesday and school started the following Monday.  My classes are 6:30am - 3pm with a minimum 2hr bus ride sometimes 4hours for off site clinical hours so I'm away most of the day and I study at night. I start to sense the house being annoyed that I'm not spending time with them but honestly I'm busy and exhausted and have poor social skills. So I withdraw more and they start to slam doors and play music loud to make their presence known and I get anxious and stay in my room. I stop eating I stop going out to the kitchen. I stop drinking water so I don't have to leave to pee. They get louder outside the door so I just put in head phones and try to tune out hidden meanings in songs they play and words they say.  Also my sister confessed to me that her husband was nasty to her while she was pregnant with his child which makes me not trusting of him at all. And I'm still studying and waking up early. I truly am busy but I don't know what to say to anyone and I feel like my movements are being tracked so I stay even more silent and secluded. I'm super nice and say hello when I do see anyone in the halls or kitchen but my sister sees this as me being fake. I have 3 more weeks of the class and everyone's behavior is becoming more aggressive and dismissive and I feel like the asshole but AITAH for feeling more at peace on my own locked my room?