You’re just too young. Stay in your relationship until you either feel right about taking it to the next level or it falls apart. Just because it feels right now doesn’t mean it will always feel right. People change. They don’t always change in ways you like. Don’t marry someone until you’re 100% sure. Then when they do change you’ll actually be committed to the relationship rather than just pretending to be. Nothing is worse than feeling like you’re trapped in a relationship that no longer serves your needs.