Is my mother normal or does her behaviour need studied?

I’m a 20 year old female living at home with my mother and grandparents. My mother used to be at work most of my childhood, so it wasn’t really something I picked up on. But in the past year or so me and my mother have been fighting a lot and it’s usually her picking on me. (Yes we fought alot when I was younger but it was me due to hormones etc.)

However, I’ve been in a relationship with my partner for over a year now and she likes him. But she doesn’t like when I go up and stay at his (he lives 5 minutes away) but she uses the excuse that I have cats to look after and he should be staying at our house. I prefer staying at his as it’s more peaceful and I’m not being gurned at 24/7. His family treats me a lot better than my family does. My family have quite a lot of issues aswell in general. But she goes into moods if I decide to stay an extra night or if I’m sick.

I recently passed my driving test and couldn’t afford to buy a car on the spot so my mum said I could carshare with her. I pay half of the insurance and my own fuel money. My mum has been very restrictive of when I can use it even if she is not using it and won’t give me reason as to why. I have not damaged the car in the slightest. Is this normal?