Passion without talent,can it possible to succeed?

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I'm a sophomore from China. I know it's the critical time of my life. But I seem to be lost and don't have a clue what should I pursue. You know, when I was a child, I was fascinated in beauty of Mathematics and Physics, and dreamed to be a physicist like Albert Ainstein. However, this dream seem to be blurred more and more. One reason is that I don't think I have enough talent to deal with the complex physical problems.Should I quit this dream and pay full attention in my present majors which I'm not content with?