Should I tell my mum I'm asexual?

I'm a seventeen-year-old girl and I was in a relationship for a year when I was sixteen with a boy (which in the UK is the age of legal consent and also the age most of my friends lost their virginity), and I've been dating my current boyfriend the same age as me for five months now. I'm still a virgin. I've always felt like I could talk to and tell my mum anything but the past year or two she's been having talks with me about sex and safe sex and assault and I really appreciate that she's talking about this with me but it's still a bit awkward because she's my mother and it's also pretty exhausting because I keep reassuring her that I'm safe and I don't do anything "naughty" when I'm in my bedroom with my boyfriend when the door is shut.. And I feel like it could keep on like this. I'm quite sure I'm asexual, and I am aware asexuals can still have sex and get aroused and I don't really want to die a virgin, I've talked to my boyfriend about it and he's being really supportive but I kind of want to tell my mum, too. I mean, it felt good to come out to someone I was close to. And it would get my mum off my back a bit, but I feel like because I'm so young and haven't tried sex yet that it's not definite that I am asexual and that it could be "a phase", or I could be confused. Like, maybe I'm actually just not ready. And also, I wouldn't know how to tell my mum about my sexuality because it just seems a bit awkward. Should I bother saying anything to her?

-Thanks for your help