[Adam]

Without getting specific "reasons" for their opinions, it's hard to say much. If possible, I'd ask the voluntary advisors, "What is it specifically that gives that impression?" Their answer could either give you something concrete to think about, or tell you their simply full of it.

Talk to your assigner, see if he or she has heard any similar criticisms of you. Just say it's something you heard from casual fans and you wanted to see if there was any truth to it.

As stated before, the impression could be caused by little things in your body language; how you stand, whether you're smiling, your tone of voice, whether it looks like you're enjoying yourself. If it doesn't look like you're having fun, it could seem as if you take yourself too seriously.