Why do people assume I'm smart even though I don't feel so?

While I was in school, I was a pretty mediocre student and never very hard working. However, later life I topped my university and got called 'eccentric' by my teachers. I also write stories and poems part time.

But the thing is, people have always considered me to be smart. And specifically strangers who do not know about my life well are more prone of believing so. At first glance most people believe that I'm very serious and intelligent though I have never felt so about myself. This question tormented me more when recently someone I have been friends with for a while on a social media platform told me that he has always considered me to be his sapio sexual crush. He also told me that this aspect of mine keeps men away from me as they consider me to be intimidating.

Sometimes I feel excluded and lonely as people are never comfortable around me. Are there reasons why some people appear as more intelligent than other people? And if so is there a way to blend in?

Thank you.

Why do people assume I'm smart even though I don't feel so?
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