When you already have an opinion about something before you've given it much thought, you can call that a preconceived idea. Many people have preconceived ideas about teenagers.
Adjective
(of an idea or opinion) formed beforehand; especially without evidence or through prejudice; "certain preconceived notions"
imp. & p. p.
of Preconceive
Usage Examples
It's amazing what ordinary people can do if they set out without preconceived notions.
I just think that people take me a little more seriously as a brunette. I don't know if that's just because of a societal preconceived notion that all blondes are stupid, but it's a different kind of attitude.
The actual tragedies of life bear no relation to one's preconceived ideas. In the event, one is always bewildered by their simplicity, their grandeur of design, and by that element of the bizarre which seems inherent in them.
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Other Usage ExamplesFor somebody famous, it's weird anyway to meet someone, because they have a preconceived notion of who you are.
The discovery of truth is prevented more effectively, not by the false appearance things present and which mislead into error, not directly by weakness of the reasoning powers, but by preconceived opinion, by prejudice.
Preconceived notions are the locks on the door to wisdom.