What is the meaning of being worldly? It is being concerned with material values or ordinary life rather than a spiritual existence. In our everyday walk, we must focus on being godly instead, rather than being worldly. God commanded us in Romans 12:2 that we should not conform to this world.
Conforming to the world can be ungraceful. The world is full of chaos, evil and disaster. There are a lot of superficial values and customs that are not pleasing to God's eyes. God doesn't want any of His children to experience these things. He loves us so much and He wants the best for us, so, He instructed us to turn away from these.
Let us not copy the behaviors and customs of this world. Don't be worldly, be godly instead. Let the other people see Jesus in you. Focus on godly values and ethical attitudes, which is the Fruits of the Holy Spirit (Gal. 5:22-23). So, that you may prove for yourselves what the will of God is, which is good, acceptable and perfect. His plans and purpose for you is the best, look forward to it!