Why was this young girl staring at me in church?

She is younger than me cause a family friends daughter was with her and she was a freshmen in hs. I'm a sophomore in college and I dont look young i have a beard so I don't have a baby face but she kept looking back at me during church and smiling. I was so embarrassed cause I'm 5 years older than her. I left church quickly to avoid any awkward approach. This happens to me all of the time theses group of 5 girls stare at me and I feel akward.
Why was this young girl staring at me in church?
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