If you worry there is likely a reason - can you think about this?

Also at that age I would suggest you are a young adult about to embark on a more independent and therefore scary but exciting adult life, while you friend is a child still at the early stages of learning what adulthood will be like. Could you be seeking comfort in being with someone who is still in the same stage of life as your recent past as a way of not facing the challenges (and rewards) of adulthood?