It happens and it is not the end of the world, if you are passionate now you will be in 5, 10 or even 20 years from now. How do I know? I was in the same position my parent said yes to any and every animal except snakes, I grew up, travelled around a bit (lived in several countries which mean good thing I did not have a snake), later settled down and now I own a few snakes.
Bottom line your parents house their rules, once you move out have your own place than you will be able to do whatever you want.![]()