You've been passed some good advice already. Its best if you wait for a while, before you get urself a good dog that you've always wanted. I had to wait until I was 17 thats when I got my german shepherd. This is definetly not something one should rush into, too many dogs living in deprivation.
Now again I am looking for a dog, with the internet I am able to do alot more research and learn abt how to make the most of your dog, socialize them, train them so you can take them virtually anywhere.
Best if you wait a while, until then complete your research etc; that way you'll be ready to correct your four legged friend on housebreaking, on and off leash control etc.
And who knows with your new found knowledge perhaps your family would become a bit keen too :)