Life is Plan B. I can't think of anyone whose life is what they imagined as a child, or even as a college student.
For better or worse, we learn to be flexible and 'go with the flow'. It's okay if life takes a detour, it's just a bend in the road. Maybe it's not of your choosing, maybe you don't like where this detour has taken you.
Learn what things you can change and change it. The things you can't change can always be modified by a positive outlook. Sometimes Plan B turns out better than Plan A. Enjoy the journey!