6' 4", 185, been practicing for awhile. You may have to do some minor modification to your technique - hopefully your teacher can help.
As an aside I once went to a seminar with a 6th dan - who started his own organization. He was a very short man, even for a japanese. His 'personal' style, and what he taught really emphasized his height (or lack thereof). Obviuosly it was not very valuable to me, (never met the 6'11" guy).
What I try to tell the tall students I have is to use the 'up' motions in technique as much, if not more than the 'down' motions.
Bend your knees. Look for ways to 'stretch' uke out with your length - horizontal motion.