hey Eco, you did 2 things wrong
First you must understand that you had superior income and your enemy wasnt rading so you had economic advantage. Why this matters is twofold.
1. You left all your corpses in the enemy base, even with your economic advantage you were sending units to die, Felthas was reclaiming them, and all your eco advantage was going to the enemy
2. you didnt use your economy to escelate, you had raiders, you had map controll, but you had no way into the enemy base. What you should have done was make either
(a) heavy assult reapers or cyclops
(b) facswitched to shields and spammed 50 sheildSkirm to raid your enemies eco and force them to spread out so your own superior force could pick them off
(c) tech to striders
basicaly you won, but you then simply fed your enemy metal untill you lost. dont attack the enemy base unless you are sure you can wipe it out, and even then bring cons to reclaim!