Thanks for the link oNyx.
Yes, interaction with game objects is exactly what I was looking for. Not just between the player and objects, but also objects with other objects. I have already made tests, some of them worked ok but collision between objects and how to make objects behave like they should is too complex for me (example, players throws an object on a few crates that are stacked on each other, how they would react on the collision and fall down in a natural way). Thats why I was looking for an already made physics engine, so I dont have to worry about all this complex math
This is too hard for me, Im going to take a break from all these physics formulas and help with building the game editor. We are going to have a brainstorm how to implement our own script-language and parser, need to be able to script functions events. I think we need to stop having all these brainstorm meetings and acctually start to make the make, or we will never be able to finnish anything