Whats up with my skateboard wheels?

i got the 51mm hubba ice cubes from zumiez. i have reds bearing, their a little dirty but nothing to make them go slower or less distance. i know its my wheels though. i skate around my neighborhood alot. its just street terrain, like actual highway, city street thing. ill push like a million times and go good for about 2 second, but then i just stop moving. the only reason ill move from my regular spot is cause i pushed all the way. what do i do?? i got them like a month ago, custom board with them.