He doesn't scare me. Without his mask I look at him go...... "Does your mom know you're out this late?"
Then he reaches out with the Force and squeezes your heart until blood flows out of your ears.
Kylo Ren is the Star Wars equivalent of Star Trek's Charlie X. That's one of Trek's best episodes because it is so haunting--a tantrum throwing adolescent with the power to make people not exist.
Pretty scary to me.