You will be interviewed by a 2nd year if you choose on campus.
GSB usually select 50-60% applicants for interview, and among those people, 40% get admission. The admission rate is therefore around 20%. Hope this helps.
Don't feel bad. Interview is only a part of the whole package that they will evaluate. Even if you don't do it well, as long as you don't blow it, you will still have chance.