How to defend while being offensive

I really want to start playing offence, since being deffer every freaking time gets a bit boring, but I just don't get how can people survive so long building only offence. I mean at early game of course you can just dodge all of the incoming attack, but what are you going to do when they bring Rams and Catapults ? I can't dodge anymore and defending with offensive troops is pretty useless as well.

How do you deal with those attacks as offensive player ?