At first I thought you were a guy but saw your profile.Well,I'm a guy who never once has mistaken a 10 year old girl as being within a hundred light years of 18.
Just sayin'...
When I was 11 I was mistaken for at least 16, people asked me for help in stores thinking I was a clerk. At 16 they thought I was 20+. At 24 they thought I was a student while subbing at an all girl Catholic high school.
NOW I certainly look my age. LOL