Yes. 22 is considered "young adult." But don't worry, marrying your childhood sweetheart is overrated. My recent long term relationship (2 years) was with a guy I'd known since high school, but he wasn't who I wanted to spend my life with. THAT'S the part that matters. The marathon, not the sprint.
No, who cares what you say. I was with my ex for 10 years and rarely did anyone even ask how we met, let alone did I go around announcing how sweet it was that we met when we are kids. Don't put any pressure on it