How can I convince my parents to let me get a BABY CORN SNAKE? I'm 14 years old and hve had a pets before!?

So, I have had a LOT of pets in the past...2 frogs, a tarantula, a hamster, hermit , even a beta fish! They all died, and just recently my hamster Cujo that I had for 4 years. And I have a new hamster now (robo) but my mom is against ANY NEW PETS! And I just want to know how I can possibly change her mind.