Hi Marcel,

It seems to me that most of the replies you've had up to now are from current keyboardists who graduated from piano. They surely came to a time when they wanted to reduce the hard work of accompanying a melody with the left hand , which on a piano is damned hard work
As you are only 16 (I don't think I was ever 16 and it's too painful to try and remember) , I would suggest that you have a good beginning with your keyboard to play music. The question you need to ask yourself is 'do I want to become an accomplished pianist? or do I want to make fantastic music in the easiest possible way?
It would be of course extremely helpful if you learn independently all about the theory of music but it isn't necessary to have to play the piano (as opposed to keyboard) to achieve that.
Hope this helps
cheers
Eddie

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Eddie from Rotherham
www.yamahakeyboards.info