What about attending a conference specific to the field you work in? Sometimes sitting in a classroom with others as excited as you (and others willing to learn) is refreshing! I have many times I feel similar, but then I attend a lecture or read an article or something and am re-energized, mostly because I love the field I am working in. I am 1.5 years in, but considered leaving my job (but not the career!) because I felt similar and no one I worked with wanted to train or teach me. Luckily, one of the docs took a special interest in my education and now I don't dread going to work. Maybe you just aren't working with the right people?