The big gripe I have about the game is how unpredictable the economy can be. Sometimes the numbers fluctuate randomly or resources can be difficult to obtain because nobody wants to work to get resources for your dying economy. Plus, if you don't have railways, you are screwed until around 1850 because you have to wait for 5 technologies if you are not playing in Europe, and you probably are over the infrastructure limit trying to fix your economy.
So where did you play? Where in particular that your economic development far outpaces your tech spread, and that has no access whatsoever to shoreline?
(while I'm sure there're a couple on the map I doubt you've played those countries, mostly they're so sparsely populated in the real world today)
If you have options, like the shoreline port option, or the high literacy (thus fast tech spread) option, then those are the way to play.
In any case even if you play a country without options, Paradox games, later starting date ones in particular, are more bent on historical accuracy than balance.
Playing something like Bhutan or Ethiopian minor is naturally far more challenging than playing Britain and France.
Forget what others say they conquered most of the world in 50 years. If you play a minor nation, set more realistic goals for yourself.
Maybe you'll become a regional power by end game, maybe you won't, maybe you'll get conquered by a major power in year 1900. It's an open-ended game where many outcomes are possible.