Can't remember passcode?

I got a new phone (the iPhone 6) and I keep getting a box pop up every few seconds saying sign in to iTunes Store or something like that and it's annoying that I have to keep dismissing it. I would put in the passcode but it's an email I made ten years ago and I don't remember the passcode for apple or gmail so there's no way of recovering it. My phone should be registered under my current email, (like it says it is in settings) but I can't download anything and some of my apps won't completely load. I would also like if the box would stop popping up. Gmail doesn't have any way to contact them and last time I called apple, they were no help.

ITunes is not the same as the icloud account, so your phone could be registered with your new account, but your iTunes account is the one that deals with apps and stuff, give me a minute to see what i can find to help you out.