Confused and horrible at SC2. How does a noob go from bronze to GM? [on hold]

Confused and horrible at SC2. How does a noob go from bronze to GM? [on hold] References Bought the game 1 and a half months ago, stuck in bronze, 2nd position(win:50, lost: 58) but I\'m horrible and don\'t know how to get better. I\'m using hotkeys, camera keys, constantly train scv, upgrade my units, expand but still get mega PWNED by all 3 races. My wins have generally consisted of leavers, players that freak out at a cloaked banshee and so on. I don\'t have a build order. Also I feel that I don\'t know how to counter the units that my opponent has. Every time that I play, my army generally consists of upgraded marines..some marrauders, siege tanks and some medivacs but as I said, I get mega ultra pwned. So, I know that this kind of question may be broad but any advices on how to get better? Thanks in advance!