<human>: Could you distill the essence of the text into 1-3 sentences?

I'm an administrative assistant at a University and have been for almost three years. I've been working on my Master's for the past two years (will be graduating May 2017). When I first joined on, my plan was to get a degree and then find my way into HR somehow.  Lo and behold, a HR Benefits Coordinator position has opened up at my University. I will not make much more money than I'm making currently, but I could get my feet wet in HR. 

Thing is I'm that type of person who is for the most part pretty loyal to the people with whom I work. I'm concerned how I'd bring it up to them, especially since 50% of the staff is dependent on me. That and I'm afraid. This job has spoiled me with how much downtime there is and few responsibilities. It's an easy job that I do well and I finish my work quickly, so of course I'm afraid I'll drop this position to end up failing in HR. 

Advice for not feeling like an unambitious, scared, lazy person?
<bot>: internal job posting came up that falls in line with career plan, but afraid to leave people I like working with and more afraid of new responsibilities and failing at them.