This is a reflexive verb, which means that the "se" must correspond with the subject. In this case the subject is "yo" which means that you must change "se" to "me"
You will then conjugate the verb normally (I am going to assume that you need it conjugated in the present. If not let me know)
Explanation: Because if María says this she would be recognizing that Juan is more intelligent than her and always people believe that they are smarter than other people.
