How do I quit my sport?

Hello, I’m a sophomore playing at the highest level of my sport (not specifying cuz I don’t think it’s relevant)and I don’t think I wanna keep going with this throughout my senior and university years. My parents have invested lots (thousands and thousands) of dollars into schools and development programs, but I’ve never really been completely invested in making a career out of my sport. I know it’s my fault for being sort of opaque about my intentions and goals, but I want a normal life and I have no idea how to break the news . They’ve been pressuring me a bit to choose a school ( which I’ll have to commit to for the rest of my Highschool life)for next year, but I’m trying to put it off for as long as possible. I’ve already “soft launched” the idea of quitting ( saying things like “it depends on how I develop” and stuff like that) but I haven’t been able to really say I don’t want to play anymore.

Advice please?