Hi, Ive been in a similar situation with having strict parents to say the least.
If you want to move into student accommodation you should do it regardless of what they say. Your 18, your parents aren't in charge its your life. I'd highly recommend it, you'll meet way more people and be closer to uni life to help make friends and get to classes quicker.
To my knowledge there isn't any female only accommodation in the sense of buildings with only girls in them. But most places don't do dorms from my experience. Usally the options are shared living and living alone. Shared is cheaper and you only share the kitchen and bathroom, you have your own room sometimes if your lucky a bathroom. Usally in these situations you can go in with friends or the accommodation/uni will group people up. From what I've seen they can take requests if you want to be with only other girls but from my experiences and from what I've heard usally that's the default anyway. Guys with guys, girls with girls.
While sharing can be a great experience from what I've heard living alone is also great. If you chose to go with that route typically called studios, you don't have to share a kitchen or bathroom. The buildings also have communal areas such as gyms, common rooms, etc but there shared by everyone in the building and are up to your discretion if you want to use them or not.
I will say living alone can be very difficult but there are benefits. I do wish I had done it in my first year but I didn't.
I forgot to mention, cist wise it varys, my place is 171 a week for a studio, I'm private renting at a student accommodation building. From when I was looking to book studios vary from 160+ whereas sharing with others is as low as 110 a week. It varied by place and it might be cheaper if your uni offers halls. Just have to look around, they go fast tho especially studios. The place I'm staying sold out in a couple days back in October. There might be some left now but they'll be more expensive and less ideal. The prices usally go up as the year goes on if you book early in October/November you get cheaper prices and have more choice.