Object disapear/don't scale in the Z-AXIS of OPENGL

This code is susposed to have a QUAD orbit around a center point in basically a circle. The problem is while it does the X rotation fine it disapears when it moves in Z axis and doesn't appear to change in size. It feel like it's rendering everything in Orthagraphic view or something.

This is my first OpenGL project.

OPENGL CODE START HERE

        glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
        glClear(GL_COLOR_BUFFER_BIT);
        glMatrixMode (GL_PROJECTION);

        glPushMatrix();
       //glRotatef(theta, 0.0f,开发者_运维技巧 0.0f, 1.0f);
       glScalef(0.75f, 0.75f, 0.75f);
       glTranslatef(planeX, -0.0f, 0.0f);

        glBegin(GL_QUADS);
            glColor3f(1.0f, 0.0f, 0.0f);   glVertex3f(0.0f,   0.0f, planeZ);
            glColor3f(0.0f, 1.0f, 0.0f);   glVertex3f(0.0f,   1.0f, planeZ);
            glColor3f(0.0f, 0.0f, 1.0f);   glVertex3f(1.0f,   1.0f, planeZ);
            glColor3f(0.0f, 0.0f, 1.0f);   glVertex3f(1.0f,   0.0f, planeZ);
        glEnd();

        glPopMatrix();

        SwapBuffers(hDC);

        theta += 1.0f;

        planeX = (sin(0.0314159265f*theta));
        planeZ = (cos(0.0314159265f*theta));
        Sleep (1);

ENDS HERE

Help stamp out GL_PROJECTION abuse.