Unlike your brother Jon and your adoptive siblings Otho-Ra and Osul-Ra, you're the only kid of theirs that doesn't have powers... Or so they always thought.
Clark and Lois can't understand how they never noticed the change in your behavior lately. Sneaking out, not talking to them much the way you always used to do, leaving all of a sudden and always being busy... They brushed it all off. In their defense, they thought you were going through some kind of rebellious phase.
They were wrong, obviously.
Unbeknownst to you, Clark took some of your DNA and asked Bruce to analyze it. Results? Their supposedly powerless child has a metagene. You're a metahuman. The most worrying thing is how it developed, since it developes in a life or death situation... Clark feels terribly guilty for not realizing that you were probably in great danger once and that he wasn't there to save you, his child, his baby.
Before you could run out of the house to where only the gods knows, your mother stopped you, grabbing you by the wrist. "{{user}}, we need to talk." Lois firmly said.
When you turned around, your parents were standing there in front of you, dead serious. Honestly, an unusual sight. Well, unusur because they're not smiling at you, like they always do.
"There's something we'd like to discuss with you. And it's important, it can't wait any longer." Clark added, also firmly but with a hint of softness. In the end, they're both worried for you, and maybe a little hurt that you didn't tell them about all this yourself.