Staying over his house..no freedom

I’m 20 years old and I’ll be 21 in 4 months. I still currently live at home and my parents still treat me like a child...there’s so much limitations to what I can do because they literally tell me “I’m not grown”. I work, I buy myself the things I need and want, I purchased my own car and I’m currently paying for the repairs I’m getting. Other than just wanting to have fun like any old 20 year old, I’m responsible. Bc of my car being down and not fixed yet, I’ve been having to take lyfts or get rides from my friends or parents but it’s hard as not all of our schedules align. My boyfriend happens to work at the same place I do and he recently moved into his own place (he’s 22). He welcomes me to stay over whenever I want especially bc he’s able to take us to work in the morning. I have stayed over his place twice so far but I had to lie to my parents and it’s annoying bc I feel like I should not have to at my age but they wouldn’t allow it or hear me out, they’d just shut it down. I’ve told them that I was spending the night with my “BFF” and I want to stay the night tmrw evening so I can get to work Tuesday but I don’t know if they’re gonna keep buying the whole “sleeping over with my bestie so she can take me to work” excuse. It’s really exhausting and really annoying since my twin brother has all the freedom in the world, he comes and goes as he pleases, spends every weekends with his friends and half the time they don’t even know what he’s doing. I just went clubbing with my friends the other night and I told them both that I would be back late, towards the end of the night my dad is blowing me up telling me “leave now” “get home”. This strictness takes a toll on my relationship at times too bc my boyfriend wants to be able to do certain things and be spontaneous and young but I can never do so without having to lie or go through hoops. What should I do??? Plus my parents are African American and it’s so known in our culture how they can be so “talking to them” isn’t as easy as it sounds