I dodge the fighter fire, I move around using keys and mouse, continuously firing back and yet my ship KEEPS DYING.
Are you actually using your EMP, Electronic Countermeasures, and Conversion Module? There are specific times that the devs pretty much *designed* for you to need to use the EMP and/or ECM in order to succeed, and you're pretty much assumed to be toggling to Power to Blasters whenever you're blasting and Power to Shields whenever you're not. The heroic space missions aren't designed under the assumption that you're not using every tool at your disposal. They're designed under the assumption that you're actually using everything *in addition* to knowing how to dodge rocks and use proper target priority.