I agree that many scriptures are applicable to individual believers but this isn't one of them.
Jesus was speaking to His eleven, and only to them, and while somebody may make the argument that in one book the writer stated that the other disciples were also present nevertheless in that book his direct addressees were still the eleven disciples, and the other two books directly state that only the eleven were there and being spoken to.
Therefore, your so-called Great Commission was not for any believing Tom, Dick, and Harry but for those called into the ministry of teaching, preaching, evangelizing, pastoring, and, finally, no longer extant, apostleship (check out the book of Ephesians).
Each believer is called to have an answer for the hope that is in them, and I guess that is what you are referring to, not the "Great Commission", and if so, then we have no arguments.