The ukulele is known to be the easiest string instrument that you can learn. It is probably because of the fact that it only has four strings. The chords are easier to learn as long as you would practice as much as you can. This is also easier to hold because this is smaller than a guitar.
As long as you know the chords well, you can play the songs that you have always wanted using your own style. It is a great instrument to have when you want to showcase your individuality. Did I mention that this is also inexpensive as compared to other musical instruments? You can start with a basic ukulele then change it when you get better at playing it.