The reason you have trouble with guitar is that you are a beginner. You have to be prepared to really work hard. If you are discouraged by this you will probably have the same issues with ukulele.
Yes, I suppose most people would say it's easier to play simply than guitar but you still won't be able to do it without work.
Ukulele actually is one of the easiest instruments to learn. Plus, it's fun and unique. You can visit http://ukulelehunt.com/ to be acquainted more about the ukulele and learn it online or perhaps purchase this book - http://strum.in/dummies , intentionally for beginners.
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