Nature and Originality

I would like to learn more about structures. I've never been one for writing structured poetry, but I feel like it might be a hard thing to teach oneself. Like Sam and Maddie, I've been feeling like I have a bit of writer's block lately. Normally I see something when I'm outdoors and get so incredibly inspired (Wordsworth style) that I'm anxious to go sit down and write about, having hardly formed coherent thoughts. But I feel like with the questioning of "what is quality poetry?, what is REAL poetry?", I now have a bit of self-doubt stifling the creative impulse. Like Sam, I went on Peak Weekend...and you would think that anybody would come back from that just bursting with observations and experiences that are great fodder for writing about. Yes, I had a fabulous time on the hike. But I felt no impulse to write about it. I'm wondering how I can delve past the mindset of "Oh, I've written about nature so often in the past. How can I be original about it still? How can I capture a reader and create tension and draw them in?". Because I feel like until I get past my own mindblock of having already done something, I'm stuck.
Hence: I'm trying to write sonnets for our next assignment. Operative word: TRY. I'm kinda throwing the iambic pentameter out of the proverbial window, because its hard enough to write a poem and put tension and meaning into it AND have it be a certain number of lines and syllables without getting into meter. Yeesh.
So anyway. Rhyme's Reason strikes serious doubt into my self assurance. Of course I'm taking this class to learn and become a better poet...but its hard reading a book that tells the readers "Oh, by the way. You're not actually a poet. Nice try. Very cute. You just write verse that is meaningful to you but is really mundane. Translation...HEY AMATUER- YOU SUCK!!".
Fun, right? Essentially, I'm trying to figure out how to keep my originality while writing something that meets the definition of "oh-so-high-and-mighty-erudite-poetry". Awesome.