We are of this world but not of this world.
This is a puzzle and requires us to constantly be focused on Jesus to get it right.
We are to love, love, love -- love so much our hearts break more often than they are whole sometimes.
We are to die, die, die to self every single day, every single minute, in every single breath. Dying to self means getting outside yourself and loving Jesus and loving others and not dwelling on your own needs, desires, wants, agendas. When we take up an agenda, we limit what God can do through us.
"Do nothing from selfishness or empty conceit, but with humility of mind let each of you regard one another as more important than himself; do not merely look out for your own personal interests, but also for the interests of others. Have this attitude in yourselves which was also in Christ Jesus, who, although He existed in the form of God, did not regard equality with God a thing to be grasped, but emptied Himself, taking the form of a bond-servant, and being made in the likness of men." Philippians 2:3-7
As I'm typing this it reminds me of so many fantasy, faery world stories I love to read. There's one in particular that I want to share just a bit. Robin Goodfellow (Puck for those who know their faeries) is in the human realm being a high school student. He's befriended a girl who he always calls Princess (but which she hates). He takes the form of the teenager. No one else knows he is not of the human realm. He does though. He always does. And he always keeps track of his friend, "Princess," because he knows who she is (and it is why he was sent to the human realm). He enjoys life. He enjoys school, takes part in it as much as anyone but he never loses sight of who he really is and who his friend is. She has no idea she actually is part faery until later in the story when she needs to know.
We are to be like Robin Goodfellow in a sense. We are to always remember we are not of this world while participating fully in loving others and enjoying life. God gives us this life to enjoy though enjoyment should never cause us to lose sight of who we are or come before loving others.