Replying to Advice on quitting

So I've been playing soccer since I was about eight years old. I have grown up around it and have invested a lot of money into it. Recently I've grown away from the sport to the point where thinking about going to a practice is awful. I don't know how I should tell my parents that I want to quit. I have never really quit anything that I have spent a lot of time and money doing. Anyone have any advice on how I should talk to my parents about it? They too have spent a lot of money and time into my soccer.