Why doesn't the Earth slowly collapse into the Sun? [duplicate]

I understand that the sun exerts a force on the earth and that if that was the only force exerted on the earth then the earth would have already crashed into the sun a long time ago.

The reason the earth is not crashing into the sun but rather spins around it is because there is another force pushing the earth to go straight ahead (or something like that.. :D ). Now the combination of the sun pulling the earth towards it and that other force pushing the earth to keep moving forward results into this centrifugal force that makes the earth go round and round the sun instead.

Much like if I were ice skating and started moving forward really fast and as I was sliding forward I extended my right arm and grabbed hold of a metal pole standing there firmly I would all of a sudden start spinning round the pole. In that case, I am the earth, the pole is the sun, and the force that was pushing me forward and ended up making me go round in circles was generated by me pushing the ice behind me.

My question is, what is this other force in the case of the actual planet earth? Where does it come from and why isn't it fading away to the point where one day the earth will start spinning closer and closer into the sun until it crashes ?

Is it a vector of other forces (which ones) ?

As you can tell I'm just another physics enthusiast (but not a physicist nor a mathematician) asking the same questions over and over again so apologies in advance.