The pool you are mining aikapool.com on has total speed 56.36 MH/s Doge mining speed.  Dogecoin current total network speed is 78.13 TH/s your pool might not have found any blocks because it is very slow compared to other pools and you have less chance of finding DOGE blocks, try a larger pool which has at least 5 TH/s to increase your chances. The shares you find represent your work input in the pool you are mining they will be calculated to give you a percentage of the block reward of 10.000 DOGE, if you input %10 of the total shares into a pool during mining a specific block and if the pool finds that block, you will only get 1000 DOGE.