Well, my path was finding doing the motion control on giant dish radars really satisfying then do well in an interview because you know can speak fluently about Kalman filters. But really you should be able to be useful on a robotics team if you have good programming, electronics, or mechanical engineering skills and then learn more on the job. Learn one of those deeply and ideally a few things about the other two as well.

There are other ways to get into any field besides studying it in school, but if you are going to go to school anyway and want to study something directly relevant to robotics, how about a mechatronics or a controls engineering program?