Create an alternate ID
Avoid a lot of the worries about your ID being stolen, make an alternate ID, to use that when you are asked for your personal information. If the website gets hacked, the thieves get your fake information. If you are paying by credit card, use your real information for the Billing and your Shipping address, and if there is an option for the site NOT to save your credit card, select it. There is no such thing as perfect security, but this helps.
Write down the details of your alternate ID so you can be consistent. If you need help creating an alternate ID go to http:\\fakenamegenerator.com