How do I get over this?

So I am 24 and currently in college studying. When I was in school my brother was top of his class and I was good but not as good as him as I was more sporty but people just automatically labelled me the stupid one because I was not as smart as him. This is even though I was in all higher level subjects and even people in authority would tell me I was bright. I always hang around with brainy people too. But because I got that bullying in school about being the stupid one I just feel so insecure in my degree and feel I won't do well. How do I get over this insecurity?

How do I get over this?
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