I am going to assume you are mid to late twenties. I am uncertain what 'my cardio is shit means??
Sometimes a situation requires work to reach a point where progress can begin. From station-bike to walking, from walking to walking fast, from walking fast to trotting, from trotting to jogging, etc. The same with other cardio/conditioning stations. When you reach a point where you've got some traction you try some HIT work, and so on. Same with the resistance training. Of course you are going to have to change your habits outside the gym as well. Be prepared for a battle.