What does it mean when a girl says you look innocent?

Anonymous
So I'm a nerd but wasn't always one. I was talking to this girl whom I just got to know recently after talking for awhile, I told her I wasn't always a nerd and wasn't always the same guy that people know me astoday. She said "but you look so innocent!! And you're studying all the time!!! " Does it show she isn't interested by only seeing me as a friend or what else could she mean by this?
What does it mean when a girl says you look innocent?
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