So this is a silly new player question, but how do you repair your armor? There are repair kits for weapons, but I can't figure out how to repair my armors (other than going to a vendor).

Merchant or repairing the said armor with the same armor.

If you have Jury Rigging, you can repair that armor TYPE with the same armor type (Heavy repaired with Heavy armor, etc.), Like using Metal Armor on Power Armor, or Leather armor with a Duster, it goes on.

Those are like the only 3 ways to repair armor, through Money, collecting armor for the armor, or just wasting a perk slot to make it easier lol.

Both weapons and armor can be repaired by weapons or armor that are the same. You don't need repair kits, they are just nice in that they are universal. There are no repair kits for armor.