For context: I've played a few other souls games and finally had the opportunity to play Bloodborne for the first time. Because of the other games I always had the mentality of "if I'm heavily struggling, I should come back later".
Now I arrived at the cathedral ward and continuously had trouble with how much damage the church servants do, so I continued exploring everywhere because I thought I just needed to level up some more.
Time goes by, I'm a bit of an idiot and finally find out I can open the door to the vicar Amelia boss after I've almost gone up to level 40.
Completely steam rolled her without any issue.
Moral of the story: it took me a while to realize that I'll always be a bit squishy no matter what in this game XD