Jeff T

I have been working as an Executive Support Officer with a company for just over 3 months and it's totally not what i expected it to be. Although I am not being treated badly, I noticed that I am being relegated to menial and tedious tasks, and that my real skills are not being utilized. I feel that I am wasting my time here and that I am not getting any professional growth or development. I am now looking for other opportunities externally. Is 3 months on the job too soon to be looking for another job? And whats' the most effective answer that I can give when asked during the job interview "why are you looking for another job"? As much as possible I don't want to say anything negative about my present place of work, but I also don't want to waste my time, as well as letting other better opportunities pass by.