here is my main problem, i am a white belt, and i train in a gym which is primarily fighting, i train hard 2-3 times a day. and my main problem is when i am sparring higher belts, not black, usually green belts they do not take me seriously. i actual had one guy turn his back to talk to someone else while we we're sparring and i almost caught him in the spine with a back kick, which would have hurt him severly, considering i have a good 80 pounds on him. and i have to show extreme control because i am the only heavyweight in my club, and i don't want to complain to my instructor about it and sound whiney, i am just afraid i am going to hurt somebody, un-intetnionally. like i said it's not the black belts, they stay completely focused, and take me seriously when i am sparring with them.