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The bottom line is that you have to follow your heart. There is nothing wrong with doing robotics and enjoying something else as well.
Just to site a few examples from our team:
Our 2009 WFFA winner went to school for Digital Media Arts even though she was a kid on our 2001 -2003 build team.
Our current co-captain and build team leader is going to major in History in college. This does not diminish her love of engineering.
Our 2003 Einstein driver was a building fanatic, but went to school for Art. He knew this was his path.
Even if don't go into Engineering, you will have a lifelong appreciation of the engineering process. I have found in my work as an engineer, that if non-engineering workers have some understanding of the process, then they are more sympathetic to our engineering needs. It all helps.

I hope this makes you feel better about your decisions.