How do I change my primary email address on Google accounts? (My current primary email is a Gmail address which seems to be the problem.)
I don't think that you can do that. I would suggest loggin with your other GMail account that you want to make it primary and then add the old one as an additional email address to connect them.
You could also forward all your email from one to another or simply retrieve them via POP, if it is only for your emails.
You need to fill out a form (contact Google) to do this. Here is the form.
first you have to add alternative email address to your gmail account then delete your gmail account. Remember if you delete you gmail account all the account accosted with gmail has been deleted. http://support.google.com/accounts/bin/answer.py?hl=en&answer=32046