How to convert com.google.appengine.api.datastore.Entity to my Entity Object?

Why I get an casting error when I try to get some database object using com.google.appengine.api.datastore.Query

For example:
DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
Query q = new Query("User");

PreparedQuery pq = datastore.prepare(q);
 
 for (Entity entity : pq.asIterable()) {
    User myUser = (User)entity;
 }
 

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