we do not share your data with anyone and there are many ways to control the visibility and storage life of your data here.
but the internet is a public space and you should always assume your data could be compromised.
be smart with your password, use tor or a vpn, and use pgp for sensitive communications.
I am in the same boat currently, vendor i ordered from didnt offer next day delivery sadly. At this time of i would advise signed for and tracked delivery as stuff can be very slow to arrive and in some cases 'go missing'→