3d model problem

Hello, I created a colored 3d model in Blender, but I have some problems. I need to change the actual player mesh with the new 3d model mesh but if I export it as .FBX I have all separated objects, if I export it as .OBJ it become distorted, please help me, thank you!

To many polygons?

Try importing directly from the blend file and see what happens.

Hope it helps.