If you are young, don't worry. In a few years you will probably shrink a little. But I know what you mean. I was 6'5" with size 12+ feet. Getting stuff to fit me could be a major endeavor. Packs can be particularly problematic for me. It has gotten better though and REI is one reliable alternative. They have a stellar return policy. One point though. If you are interested in a particular manufacturer, let them know of your disappointment in not being able to get something that fits. If they know there is a demand, they will (possibly) make it.

sk