Hi there!
I think it would be a good idea to learn the piano, I played it for around 5-6 years, and you really come to appreciate the music, if you really get into it, then your creativity will shine, guitar is great too, but you gotta go with what you want to do and persist, I did guitar for a few months and still mess around at times, yeah sure, the strings will hurts your fingers to begin with, but when you keep playing, your tips will toughen up and get well 'ard :) and use a nylon string guitar if you dont wanna be cutting up your fingers!! good luck
jpxdude :D