It's OK for the teacher to be "harsh" as long as it's not personal and you don' t take it as such.
Most of us initially consider any kind of critique of our photos as harsh. My wife and business partner is a pro graphic designer and we work on multiple projects on a regular basis. As my creative director, she will bluntly tell me when my photos (selection, composition, editing, etc) aren't up to our standards, tells me to walk away from them (a.k.a. go take a nap), and come back to them later.
I know she loves me
What your teacher is trying to inculcate in you is the need to express yourself in your photos. That is not always possible or even necessary, after all, a particular photo's purpose is not always just one dimensional. But as far as the class is concerned, as far as she is concerned, she wants to see more of a definite vision.
Sounds to me like you're doing well so far. Just keep shooting and you will find yourself. Just don't expect it to take a couple of courses before that happens. How long that takes is entirely up to you, and even then your vision, your "me" in your photos will change, grow, develop as your life experience changes, grows, develops.