Spacemonkey! said...
Wind not enough.
You weigh to much.
Your kite is too small.
Take your pick.
I would say all three are working against you at the moment, plus you could add board to small, not enougth skill to kite in light conditions.
Kitting in light conditions as a bigger guy is going to be very hard, you would definatly need some special gear and the right technique to use it which could take quit a long time to learn.
Wait untill its blowing 15kts then head out and give it a crack.