No, it is illegal to contract by yourself.

A contract is a legal document, a written document that stipulates the rights and obligations of both parties. According to legal provisions, a contract must comply with the form and content stipulated by law, otherwise it will be deemed to be an invalid contract. It is illegal to make a contract yourself, because the contract you make yourself has legal flaws and cannot be protected by the law. Your P contract also involves issues such as infringement of other people's intellectual property rights, which will bring you unnecessary legal risks. Before signing a contract, you should consult a professional or lawyer to ensure the legality and validity of the contract.