A question about fast castle turtle counter

So let’s say we are going scouts as early as possible but the enemy walled up (with like 5 vills) and is playing a fast castle. What do you do at this point? Switching to archers would take too long and if you go fast castle yourself after you realized what the enemy does, you are still a lot later since he clicked up from dark age with a lot more vills. So how do you behave in that kind of situation? I see it very rarely but I find it pretty wonky to counter and adapt. Mostly if I am going scouts and my starting scout saw the full wall I won’t even produce scouts anymore. Is that right? Or is there a classic go to counter? I have some wins and some losses against that. So I’m curious.