Am I Suffering From Fecal Impaction ?

Hi, I am 21 yrs old and I am very active drink plenty of water and I am a firefighter. I recently found myself having issues using the bathroom. I am not really constipated however i dont have much of an urge to use the bathroom. And when i do got its runny and thin....and not very much. I wanted to know what i could be suffering from. Ive read that it could be a fecal impaction, but ive taken enema ( no result water just came out), Ive take miralax and just gave me runny diareah, and the only thing that seems to work is suppositorys but its still not very much stewl. Is there anything i can do to get rid of this impaction? i drink plenty of water tried tons of fiber and i currently excercise reguarly. I just feel like i cant push like my sphyctor isnt working and then once in awhile a little will come out. What should I do ?