Not only that but anyone wanting to check me out before trading can't really guage my history - how do I alter this?
when you listed them you have them marked as private check the listing on preview before you submit them.
It is due to all your auctions being private.
When you list an item for sale, on the form it has the heading Private Listing, and underneath there is a tiny box that says " allow bidders to remain anonymous" or words to that effect.
Make sure there is no tick in the box.
Pretty sure the existing feedback can`t be changed but you can change it for the future
Ref Private or Public Feedback
Take a look at this:
Thank you so much for your help - I have done what you suggested so all should now be well!