Very few girls at such a young age are able to find such a sturdy relationship with a boy. However, your feelings of loss of control, and the fact that he bailed you out could indicate that you rely on him too heavily. Perhaps you feel that without him, you would drown in your own emotions. Now let s focus on your return to shore. This brings another metaphore with water as well.
Rivers often represent life.
SO perhaps you feel like life is overwhelming as well, and you feel that you have failed, in some respects. The fact that there was a supervisor inquiring about whether you finished the course successfully means that you feel others are judging you maybe a parent or a teacher. Your reluctancy to admit your failure symbolizes your unwillingness to face your mistakes and move forward. Maybe even guilt. In reality, you must face your downfalls, and own up to your responsibility.