My TV screen start to get smalles and smalles help me

Please explain what you mean. Your screen can't get any smaller than it already is. Do you mean the picture looks small? Check the aspect ratio setting. Usually you want it set to "Full" on most Panasonic TVs.

Do you have a model number? What is connected to it? What types of connections are you using? Does this happen with all devices? Does the TV menu appear small?