Assalamu alaikum - struggling to find privacy for prayer at home

Assalamu alaikum, I’m a 17-year-old Muslim girl and I really want to keep up with prayer, but my home situation makes it hard. Everyone in the house has their own room except me. My parents and brothers each have rooms, and I share a room with my grandma. The house is almost always full, and there’s never a quiet, private space to pray. Because I had trouble practicing when I was younger, my family makes a big deal when they see me praying now. It turns into comments and awkwardness, and it discourages me. I just want to pray calmly without feeling watched or judged. The only time I get some privacy is in the car while we’re on the way to school; I pray there and try to be discreet. I’m not allowed to go out alone, so I can’t leave the house to find another place to pray. I also had spine surgery recently, so I have to pray sitting down. I know sitting is allowed, but sometimes I still feel guilty or like I’m not doing it “right.” Lately I’ve been worrying that Allah is upset with me, even though I’m doing my best. I feel stuck and discouraged and could really use some practical advice or reassurance. How can I keep praying consistently and feel more at peace given these limitations? JazakAllah khair.