Something missing?

I am a Domestic Violence and recent Sexual Assault Survivor. I've been in a non-abusive relationship for the past few months, and it's a new experience for me. I feel like something is missing from my relationship. I don't know if there really is or if it's just my history of abusive relationships making me paranoid. We've met each other's parents, and everybody gets along great. We don't live together, and don't plan to for quite a while. We're in our early 20s and are still in school. He's nothing but kind to me, though he can be a little clingy sometimes, but we're upfront and honest about our feelings and if something bothers one person, we work things out. Is there anybody who can help me work out why I feel like something is missing in our relationship?