Hmmm. A toughie. Like others I'm sure, I had a chronic problem maintaining eye contact when I was younger and still do. Several times friends and family would point out that most of the time I wouldn't look them in the eye and instead, watched their mouths when they spoke.
First, a question for all: Does it feel more natural for anyone to watch another person's mouth instead of their eyes when "direct, face to face" communication is necessary?
I always thought it was a little weird about myself growing up. I'd practice eye contact when watching TV with the characters to get better at it. You get better at it after a while through live (albeit sometimes painful, awkward, etc) interaction,. Though it's still a challenge to maintain "lengthy" eye contact for me.