(Sorry it took so long to get out. I was struggling with ideas. Hope you like it ! )

Aro - You walked in during their feeding.

Caius - He straight up told you. Like a gangster 😎

Marcus - You figured it out when you saw a painting of him that seemed to be centuries old, plus with all the legends that circled around your town, that confirmed it for you.

Felix - He almost bit you first met. Though you were upset, you were more terrified than anything at the fact the Vampires existed.

Jane - You grew up with them, and the night they were burn at the stake you saw Aro and his Coven kill all the people and turn the two.

Alec - ☝🏽

Demetri - You found out when things got heated between you two and he bite you. You passed out, and woke up as a Vampire. Let's just say this was not how you planned for your first time to go.