Help! Apparently i suck

Hello there.
I wouldn't think too negatively. Everyone has "sucked" in at one point in their gaming career. If you want to strive to become a better player, it's literally just practice and time. There are a few exceptions where being exceptionally talented becomes the difference between a great player and pro player, but to just be a overall "good" player is doable. The only thing that bugs me is when players resort to accusations or implying cheating as an excuse for their loss without any evidence.
I can't say much for piloting since it's pretty difficult to obtain a jet/heli in the first place, but here are things I think about when I play the game.

As for various topics and questions:
Where are your teammates and objectives.
If your teammates are not moving, then they must be engaging or camping depending on the location.
You can choose your pathing/flank/etc. appropriately based on that.
Where are your teammates aiming?
You can aim at areas that are not being covered.
Do you pay attention to bullet trajectories from snipers? Look at directions where you may have gotten hit?
Checking directionality and mini-map can give you advantage of pre-aiming for instance or peakers advantage.
Are you playing the appropriate gun for the appropriate distance? (Not all guns are equal and some are just not good overall)
Some guns require you to play different play styles which may not fit with the current play style you implement.
Do you use different strategies such as purposely letting enemies run pass you so you can gain the advantage later?
Do you always engage every fight just because a player shot at you?
...
This list can go on and on.

Feel free to msg me if you want to go over things more deeply. I'll be honest, I don't really want to type out everything but would rather discuss it over comms instead. And who knows, maybe you are already a good player or better player than me, but I'm just offering.