I am a polygon. None of my angles are right angles. None of my sides are equal length. What am I?

I am a polygon with 4 sides. I have 4 right angles. I have 1 pair of parallel sides. What am I?

I am a 2 pairs of equal sides. I have 4 equal sides. I have 4 right angles. What am I?

I am a quadrilateral. I am ALWAYS a parallelogram with equal sides. I am sometimes a square. What am I?

I have 2 sets of parallel sides. My opposite sides are equal. I have 4 right angles. What am I?

I am a quadrilateral. Sometimes I have right angles. I have only 1 pair of parallel sides. What am I?

I have 4 sides and 4 angles. What am I?