I recently graduated from a well known University with a respectable degree but I haven't applied for jobs that are even remotely at my level because I severely lack confidence in my ability to perform in a professional environment.
In any case, I was contacted regarding a job that wasn't connected to my degree but was in a field that I enjoyed - as well as not being advertised for someone with overly high qualifications - so I decided to interview and give it a shot.
I was hired for a job but it turns out that job doesn't even exist yet and now I'm stuck Googling things and starting out of a window 7 hours a day. I also spend all of yesterday scrolling through math stackexchange and stackoverflow which is how I found this Stack Exchange in the sidebar.
While this is all happening, I've been contacted for a few high level posts that people would be interested in interviewing me for - as well as already having an interview scheduled in a high level organisation - which had helped me realise what a low level job I ended up in.
The clear next step is to tell my employer that I want to leave, but I'm debating how to do this: should I be upfront and tell them that I feel that they lied to me about the position and I'm constantly bored or should I simply politely inform then that something better has come up?
I feel that I was definitely mislead by the company with regards to what my role would be but I also feel slightly responsible in that I shouldn't have applied here to begin with and set my sights higher. I also don't want to give my current employer a reason to dislike me as they would most likely be contacted as referees for a few of my upcoming interviews so I'd like to leave on good terms.
Oh, and lastly I'm in the UK, if that makes any difference.
EDIT: Misspelled the title. Apologies for any typos and/or formatting errors. Wrote this on the train to work.
EDIT 2: This question now makes no readable sense as I have edited out information that could identify me.