Unsatisfying relationship... something is missing... help...?

The very next time you are alone with her you have to bring up how you are feeling. You deserve to know how she feels about you. Just tell her you would like to talk to her. If you don't know how to say it or are nervous then just direct her to this website and show her your post. She will tell you after reading your question how she feels. If you don't tell her your feelings you are going be driving yourself nuts for a very long time. Take care and good luck.