The best thing would be to start cleaning up your code by avoiding clearing the framebuffer twice, moving the OpenGL init states outside the render loop, ...
Also, I'll highly recommend to stop using GL11 fixed pipeline / deprecated stuff (matrix stack, light/material properties). We provide everything in Bonzai engine to replace all your deprecated GL11 calls, just look at the tutorials (MatrickStack, Lights).
Pseudo code:
If you don't use Bonzai engine framework to create init your app, look at ModelLoadingNoFramework tutorial to create and initialize a valide glApi object.