What does this say about me as a DM.

I am currently starting the first campaign I am dm'ing. Now, we are a group of extremely chaotic teenagers with stubborn ass heads, so imagine my reaction when I realize that they are actually invested in the campaign.

I have set the setting in my fantasy world 8 years in the making. When we play, their real life supervillain selves just become calm, lore invested group. Considering this is the first game I DM, I'm kinda shocked with their behavior.

What does this tell about me, and how can I keep it up.