In general, it's believed to be a coping problem that is either learned (through life situations) or genetic (in your DNA) or both. If you're looking for a complete anxiety profile and treatment ideas, make sure you take my free 7 minute anxiety test.
The average high school GPA of the admitted freshman class at Virginia Tech was 3.95 on the 4.0 scale indicating that primarily A-students are accepted and ultimately attend.
Using acceptance rate data from previous years, we can project that the Virginia Tech acceptance rate in 2015 is going to be around 69%. You can get more information from the admissions office website at admiss.vt.edu.