No, the evidence for dark matter is strong, though not conclusive. Dark matter is matter that does not interact with electromagnetic fields (light) but has mass. It's presence is inferred from the observed large scale distribution and velocity of ordinary matter. If you have an explanation for these observations that is consistent with the laws of physics (i.e., consistent with observations on the scale of the solar system) book your reservations for Stockholm.
There are two basic forms of dark matter, baryonic and non-baryonic. Baryonic is ordinary matter which we, for one reason or another, simply cannot see, because, either, it isn't emitting light or it isn't reflecting light. The other form that you refer to is the non-baryonic form. My guess is that our theories of gravity are not quite right (on the large scale) and so we are wrongly inferring that the non-baryonic stuff exists.