You are not alone. And that is okay. Embrace "no plan." Embrace "not sure." Embrace "going with the flow" and "we'll just see how it'll turn out." It will turn out, some way, some how. But you don't need to the "how" today.. Now, it is the final semester and I am just an average student with an average GPA, and no job.
I think that "go with the flow" could be bad advice for some people. Only because some people confuse going with the flow with not taking action. To me, going with the flow means accepting that which you have no control over. However, we have a lot of control over many aspects of our lives. Determine what you want and go after it. If you're not sure what it is you want, keep yourself busy with activities, hobbies etc. be social, meet people, network. Is there someone in your field of study you admire? Ask them to lunch once a month and formally ask if they would mentor you. This is powerful stuff! Good luck!!