How do I tell my parents I want birth control

I’m technically an adult but still financially dependent. When I still lived at home I pretty much didn’t date or involve myself with boys that often, and also identified as asexual until more recently.

I have an idea on how to acquire birth control and even considered doing it secretly and out of pocket through planned parenthood so I don’t have to tell anyone, but I’d rather do it through our health insurance.

What’s a good way to go about bringing it up without making it a big deal?