Masterbating in quiet!

I'm sorry but it's soooo hard for me not to moan or breath heavily when I masterbate and I've tried to quit it all together. I just find myself horny with nothing to do. I'm 14 and I (of course) live with my parents and it's getting really hard to fight the urge to scream when I orgasm. I could just spend hours in there with the door locked but my parents are on my case about why there's "sounds" and locked doors all the time. How do I keep quiet and still have a "satisfying" time without getting caught?