When you register a domain name your contact details are recorded in the so called WHOIS database – that maintains the contact info for all active domains. A domain’s WHOIS info is publicly available as per ICANN regulations.
If you feel upset exposing your contact details publicly, you can legally hide it by ordering Domain Privacy Protection to your domain. The service Domain Privacy Protection is available only for domains that are registered/transferred with us. You can purchase and apply Domain Privacy Protection to your domains over your control panel, via the Domain Manager > Settings > Security >Buy Whois Protection