[Kemal]

You're indeed probably overexpanding to explain your problems tech wise later on. Economic management in civ4 is a lot more difficult than it was in civ3, which is why - as akots explained - military vics are way easier to achieve in general.

Also, prince in civ4 is probably about equal to monarch-civ3, monarch in civ4 is more difficult than emperor-civ3 etc. Cottages and keeping a very close eye on your own and enemies diplomatic relations are key to doing well as a builder... these games can we be won all the way up to immortal even on large maps, (deity large is impossible imho on non-rigged maps/settings), but again as akots said, these games are no longer fun.

Don't aim to beat the highest difficulty, instead play the game on the settings you feel offer a decent challenge but still allow you to relax as well, unless you're a hardcore civ-junkie.