Also I would disable the extra mods. Building Upgrade System will definitely throw off balance, trading posts into towns one might. Naval warfare one might be fine, but why are you modding something you've never really tried? I haven't looked into it, but that's a possible conflict if it was made for an older version.
Lastly as mentioned you've just got really low yields. If barbarians are such a problem for you, why enable raging barbarians?
Learn the fundamentals before you start getting tricky with it. Play standard map size, standard pace, normal options (tech trading vs research agreements optional) Turn off events (no need for more complexity or randomness) do a continents or Pangaea map and grab a balanced but good civ like Poland or Celts.