I wasn't underage, but I had my cousin's creepy godfather touching me in ways I didn't want him to at her wedding. Onlookers just thought it was funny. I very quietly threatened to take him outside and break his nose if he touched me again.
The sleaze started for me when I was still at primary school, too. Not that it should make a difference, but I always looked quite a lot younger than I was, so it wasn't boys and men mistaking me for someone older. I was never allowed my hair cut because my mum liked my long blond hair, even though it seemed to attract attention I didn't want. It all came off when I was 14 and it hasn't been longer than a short bob since then.