Unless you have hosting with GoDaddy, it's not at all likely that your domain is "hacked". You can easily check your domain to see if subdomains have been added to the DNS (chaeck "Manage DNS" in the Domain Manager listing). If you are hosting somewhere else, you may check with that host to see if subdomains were added to your website there.
What's more likely is that you have a domain that was in existence before you registered it.It could have been in use, expired, returned to the registry, then registered new by you. The information you are seeing is data cached by Google (not GoDaddy) over the history of the domain. You will need to contact Google to request the removal of this data.
TLH - GoDaddy | Community Moderator Supporting you at x.co/247support