My boyfriend is perfect but I'm not ready to settle down?

This is really selfish but I feel really young, he is 6 years older than me and he wants to settle down, I love him and I'd love to have kids with him but also i just don't feel like I've seen the world or dated enough, he is the first guy I've been this serious with and i don't know what to do. What would you do?
My boyfriend is perfect but I'm not ready to settle down?
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