As Aru Ray said, knowing that this is actually a quite common feeling is helpful in overcoming it. Ways you can achieve that include discussing it with others, including accomplished researchers, and reading about it. Here are a few texts and resources on the topic, which I recommend heartily to both students and faculty:

• A recent article in the Chronicles of Higher Education, which sums it up nicely. And also, some reactions on the web: 1, 2
• A personal experience is related here
• The references over there make for pretty good reading too…

As Aru Ray said, knowing that this is actually a quite common feeling is helpful in overcoming it. Ways you can achieve that include discussing it with others, including accomplished researchers, and reading about it. Here are a few texts and resources on the topic, which I recommend heartily to both students and faculty:

• A recent article in the Chronicles of Higher Education, which sums it up nicely. And also, some reactions on the web: 1, 2
• A personal experience is related here
• The references over there make for pretty good reading too…