My dad is from Spain and my mom is from El Salvador what am I? am I considered mixed?

If you mean your ethnic group, you can say you are hispanic or latino.
The national origins classified as Hispanic or Latino by the U.S. Census Bureau are the following: Spain, Argentina, Cuba, Colombia, Puerto Rico, Mexico, Dominican Republic, Costa Rica, Guatemala, Honduras, Nicaragua, Panama, El Salvador, Bolivia, Chile, Ecuador, Paraguay, Peru, Uruguay, and Venezuela. :-)