I think with some research you will feel the same. That group of 144,000 was filled a long, long time ago.
My research concludes that the 144k are around during the conclusion of this system of things . The only difference between them and the great crowd is that they die as martyrs to attain a possition as kings for a thousand years .This is not the symbolic death the WTBTS teaches ,it is a literal death . Revelation is clear that the last one will die by the ax , that is when God gets really upset . revelation 6:7-11