No, refusing to let the police search you is not an admission of guilt. In the United States, individuals have a right to refuse a search by the police without it being considered an admission of guilt. This right is guaranteed by the Fourth Amendment of the U.S. Constitution, which protects citizens from unreasonable searches and seizures.
The police may ask for consent to search your person or property, but you are not obligated to give it. If you do refuse a search, be sure to remain calm and polite; if you become hostile or aggressive during the encounter with law enforcement, this could be interpreted as a sign of guilt or suspicious behavior.
It is important to remember that even if you refuse a search, law enforcement can still obtain a warrant if they have probable cause to believe that evidence of a crime exists on your person or property. Therefore, exercising your rights does not guarantee that the police will not find evidence against you in the future.