I play on xbox, RTS is a lot of fun and playing against the computer is great way to learn the game.
I would encourage you to not be so hard on yourself about the score of an A.I.
opponent.
Often times the computer is much more difficult than an actual player, especially on xbox.
I think the next step is playing against human opponents, whether you win or lose you can save the replay of the match and figure out what things you can improve on, most of the time it is idoling your TC or idle resource/poor resource balance, or an idle military.
Also getting away from the Auto ECO system I highly encourage, you will learn to hold left trigger and task que vills