Why are children (ages 12-14) so desperate for a romantic and affectionate relationship?

I remember when I was 12-14 and I was SOOO desperate to find love. It was all I thought about. Now when I am older I see that other kids think the same. I was the other day speaking to a 12 year old and he told me that he was depressed because he wants love but can't find it. (not in a sexual way) Why is that?
Why are children (ages 12-14) so desperate for a romantic and affectionate relationship?
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