Hey Nuclear Superpower!
A lot of now experienced players started the game with some serious "military Misadventure"--myself included.
You need to make peace with your neighbor and focus your effort toward building an economy that can support a strong military force. Try every overture possible, if that doesn't work ask a fed (I'd suggest United confed or GREF) to help you negotiate a peace). If that doesn't work, abandone your country, and buy one somewhere else. Then start working on learnin the Econ part of the game.
Most importantly, change your name. Remember the words of Vito Coreleon. Never threaten or even show your anger. That just warns your enemies.