Galaxy Rotation Curves
Stars in galaxies orbit at roughly constant speeds even far from the center, where there isn't enough visible matter to explain this. The flat rotation curves suggest an unseen mass, dark matter, surrounding galaxies in a "halo."
Gravitational Lensing
Light from distant objects is bent by gravity as it passes massive objects (per General Relativity). The amount of bending often exceeds what can be attributed to visible matter alone, implying extra, invisible mass.
Cosmic Microwave Background
Precision measurements of the CMB (from the Planck and WMAP satellites) show patterns in temperature fluctuations that match models requiring dark matter to explain the structure and distribution of matter in the early universe.
Large-Scale Structure Formation
The distribution of galaxies and galaxy clusters across the universe fits simulations that include dark matter. Without it, structures would have taken too long to form.
Galaxy Cluster Dynamics
The velocities of galaxies within clusters (noted by Fritz Zwicky in the 1930s) suggest much more mass than what we see. Clusters also show similar discrepancies in gravitational lensing and hot gas distributions (like in the Bullet Cluster).
Bullet Cluster Observations
In this famous collision of two galaxy clusters, most visible matter (hot gas) was separated from the inferred gravitational mass, which stayed with the dark matter, providing strong evidence that dark matter is a distinct form of mass, not just a misinterpretation of gravity.
These observations consistently suggest the presence of an unknown, non-luminous form of matter, dark matter, constituting about 27% of the universe’s total mass-energy.
tl;dr: You're retarded & don't know what you're talking about.
That being said, yes, science should be viewed skeptically, that's how over time it gains consensus. Don't confuse the very concept of science with the corrupt shit humans do with it. COVID really did a number on people.