Well yeah, that's why if rebirth is real, the past memory will be erased, like soul will be cleansed, so none will feel it's creepy to mentally adult is liking/dating a little kid. And imho although MC is already an adult before rebirth with intact memory, she sometimes acts like her age and I assume it's body memory. And so far she doesn't implying love particullar person but those people - Hal, Julian, Rias(? Forgot his correct name), and the first boy in contact with MC - MC knows what will they become and her affection is shadowing with her feeling towards them in the past life (such as she put trust on Hal and she understands the pain of losing a family member when she saw Julian is emotionally suffered by his mother'a action). I don't think the romance is (kinda) creepy tho because when those kids' affection and feeling toward MC doesn't have a tint of sex or adult stuff. They have feeling for MC because MC is the one who reaches out for them first even they hide it so people don't know. And MC obviously doesn't have any lustful thoughts about them too