Part of why people are afraid of different things is because of the lack of understanding of what it is or what it is about.  Try to find out all there is to know about wisdom teeth extractions. There are many very good websites that go over the step by step process.  Also ask your dentist all the questions you have about the process and the care after the removal.

Tell your dentist about your fear and concerns.  This will help him explain to you how the process is not really all the scary.   One other resource  is a course this blog.  Many people have the same fears of the dentist and extractions.  There have been many good replies to those questions.  Try checking them out as well.