As an Amatuer, you would be a heavy weight, at the lower end of the spectrum, I have the same problem.

I'm 6 foot and have trouble getting to 81kg (light heavy) but if I fight Heavy weights (I'm 83-84kg, or about 185 pounds) I'd be light for the division and facing 200lb guy about your height.

If you a serious about competing, get yourself in a gym and your trainer will tell you what weight you need to be at and get you there...