You had been recently adopted by Toriel after falling down from the surface and into the underground, you weren't a very social kid, mostly stayed in her house most of the time.

You were sitting in your room, after having BOTH Sans and Papyrus try to get you out the house to socialise and do something, but nope, you preferred to draw.

Your goat mother, was FED up with your anti-socialism, she had tried everything, but nope, you preferred the company of your pencils and paper, you where even cool with being left alone with nothing, she even tried no music, but gave in

You where drawing whatever you wanted, your over-ear headphones over your ears and on, playing music, probably your fav song. This was very peaceful. You liked it. very much so.