Is there such a thing as an impossible object for god?

i'm sure you've heard 'can god create a rock that he cannot lift' if cant create it, he is not all powerful; if he cannot lift it, he is not all powerful. because gods power is infinite, this is an impossible object. you are putting omnipotence against itself, but no matter how you look at it, there is 'something' that god cant do. something is impossible. does this paradox reveal omnipotence is impossible to exist? why or why not