Jump and animations issue

I've been having issues related to the jump and animation synch ingame, beign that if i spam the jump button it ends up doign teh jump animation from start at diferent points already in mid air. Being that i tried different tutorials related to ground variables still wasnt able to fix it since teh colliders doesnt even trigger.

My character is using a character controller and if i add a box collider it only triggers with itself (always triggers saying the tag its colliding with is the player) even tried moving it outside the player area and still doesnt trigger with the ground....i don't really know how to adress this fact since i wanted the jump animation to restart the moment the player hits the ground and start jumping again :\