Compared to Call of duty, insurgency, battlefield I am trash at this shyt, any tips breh's can give me?
Relax and try not to consistently push, stick near teammates if you can.
Have your shields recharge as much as you can to live. Staying alive has advantages in minute play (ex. adding chip damage, scaring off solo pushes) or being able to overwhelm in MultiVS1 scenarios.
Higher ground is important overall clearly, but is often overlooked with getting the head damage in since a lot of the ranked maps have more vertical in the maps.
If you're still having trouble and want to contribute, be an objective goon. Too many players treat each game like it's nothing but mindless Slayer.
You can also cycle more important items simply to deny the enemy using them - you don't have to be good at them or even use them, just denying its use is more than enough if your teammates can take care of the fragging.
Be a snitch. Communicate what you can if you think it's important.
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Also, a good video on the frustrations of 343i's lack of progress: