If your 18 and still in high school can you sign own papers-?

It depends on the jurisdiction and the specific documents in question. In general, minors (people under the age of 18) are not considered legally competent to enter into contracts or make other legally binding decisions. However, there are some exceptions to this rule. For example, in most jurisdictions, minors can sign contracts for necessities, such as food, clothing, and shelter. Additionally, some jurisdictions allow minors to sign certain other types of contracts, such as employment contracts or contracts for educational purposes, with the consent of a parent or guardian. It is important to note that the laws regarding minors' capacity to contract vary from jurisdiction to jurisdiction, so it is always best to consult with an attorney if you have any questions about a specific situation.