I see this game a mental martial arts. Undisciplined fighters are destroyed by disciplined ones who keep their head cool.
So, like martial arts you have to practice drills until you get the moves down pat. Most of your deaths are due to basically panicking or being suicidal.
To start I'd practice watching your mini map while you are shooting an opponent. Mini map is vital to this game. You keep drilling this until you are able to shoot an opponent AND see the corvette sneaking up on you. Don't be that guy who focuses so hard on the target that the corvette flies right up to him and sits on top of him until he is dead.
It is a skill to be able to see the corvette sneaking up on you. Keep practicing until you never get snuck up on again (it will always happen though because the corvettes get sneakier and sneakier). But then you need to get more alert. And so on and so forth. It never ends.
But this skill will also help you avoid the dreaded goliath torpedo attack from fast destroyers. So it's something you must master.
While you're mastering the minimap awareness skill, you should also practice deploying shields. Don't ever die with full energy. NEVER! If you look at T4 players, often the ONLY time they die is when they have run out of energy. Dying with full energy is like a pro boxer not putting up his hands and copping a right hook to the temple. It's the ultimate humiliation.
So, practice watching minimap and using energy wisely for starters. These are basic skills that will help a lot.