Paul said in Romans 12:2, Do not conform to the ways of this world, but be transform by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God. What does it mean to conform, it means to take shape of something or be pressed into a mould to take the shape of the mould. Basically, being what you’re not, or basically trying to fit in. You won’t know or acknowledge the will of God if you are trying to be what God doesn’t want you to do. God doesn’t want you to be like the world but to stand out. We cant be Christians in secret but in public there is no telling apart from the sinners of the world cause we have moulded ourselves to their shape.