Where can i fined a customizable advanced 3d physics game maker?

I'v been spending some time learning c# javascript html gml and had an insperation to begin a 3d modling physics game where i need alot of room to put in my ideas. i'v spent the past few days browsing the internet looking for a 3d physics game maker and found quit a few but i'm afraid that these programs will limit me to how far i wont to go i mean I'm willing to start with c++ or java on notepad if i have to. so with my last hope i'v commed to you guys hopping to fined a complete customiazble 3d physics gamemaker.