The first step you already took: decide you want to do something big, and be willing to go the extra mile to get there :-).
At this early stage in your career, my advice would be to start exploring "small bets". Small bets are affordable and achievable ways to explore an idea without letting perfectionism, risk-aversion, or excessive planning get in the way.
You can begin by talking to professors, reading IEEE magazines, joining groups in LinkedIn on topics you find interesting, etc. Once you find a topic you like, start studying and looking for opportunities to practice what you learn (in a school or side project, volunteering for an organization, etc.). If it seems promising, you can continue on the same path; if not, you can just choose another topic to start studying and getting better at, until you find something that will be worth pursuing in the long run.
Remember that the skills that allows us to develop a successful career typically aren’t the most fun or easy to develop. If you can force yourself to work through the pain and get better at something that others value, the rewards are going to be huge.
Good luck, and come back to tell us how you are doing!