Problem with 2 apple Id's
I have a problem with my apple ID. So about 1 year and a half i bought an iphone and i wanted a new apple id because the one I was using was my father's ID so I created one but apple doesn't allow me to create that account without a credit card number so I wanted to erase it or something but I am not sure if i can do that but the think is that i want to erase that ID. Can someone tell how can i do so without entering my credit card info?. Any help would be greatly appreciated!!!
MacBook Pro, OS X Mountain Lion (10.8.2)