Linux: Squid Proxy Hide System’s Real IP Address

Privacy is very important and noticed that my squid proxy server is displaying my desktop system’s real IP address. I’ve a corporate password protected squid proxy server located at My clients work from home or offices via A/DSL or cable based Internet connections. Squid should hide all system’s IP address, but it is forwarding and displaying the system’s IP address. How do I configure squid to hide client’s real IP address on a Ubuntu Linux 14.04 LTS server?