You filled in your details and logged in on a spam email - that's what wrong. You will probably now get bombarded with junk mail.
Its obviously too late now but never open emails from people you don't know or from Banks asking for your details or from Ebay or Paypal. Even if you have an Ebay account, the fact that you haven't anything for sale should have alerted you.
Or if you are not sure, log on to the website yourself, without clicking on any link contained in the email.