That's a very honest thing to say!
But the grass is always greener on the other side. There would be issues no matter what. I think "knowing" someone goes deeper than your career, education or hobbies. You should look to make it work. Show an interest in her activities and develop a good partnership.
Occasionally check in with one another to see if there were any missed moments of connection, where one of you failed to show an interest in something the other was doing, and then talk about how you can make the moment more pleasant next time.
I'd recommend the book Don't Sweat the Small Stuff to help manage some of these feelings.
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