Mine too, also HTC Sense. My "My Contact Card" isn't called 'me' but rather has my name - it's linked to my facebook account which I think happened during set up. The HTC site says this about "My Contact Card"...
"My contact card provides a convenient way to store your personal contact information so that you can easily send it via MMS. In addition, you can log in to your Facebook and Flickr accounts to receive notifications of your contacts' updates and events. On the All tab of the People screen, tap Me, and then tap here [??] to edit contact."
Anyway the result is that my phone has a perfectly good contact record for me from Google Mail/Talk (with my various phone numbers, email and physical address) and another useless one sucked in from Facebook - it doesn't seem possible to link my personal Google contact record to my Facebook Record or to delete the 'My Contact Card'. That's a bit of a mess really, shame as the rest of the gmail/facebook integration is very good.