Em

I have been teaching myself to play the ukulele since about September and I have a collection of books to work from, I don't actually have any musical talent but I keep practising anyway.  I can manage chords that only require fingers 1,2 and three but I am struggling with chords that require the 4th finger because I have short pinkies!  I can manage Cdim but Em is a problem.  Not sure what I can do about it though.