i feel your pain dude i suffer from the exact same problem.
it has pushed me right to the edge combined with th loading bug...
i dont own a horse as i dont like mounts and you can use this instead albeit a little slower.
even if i had a horse it would be game breaking.
Avoid it man.
I try PVP until it's getting frustrating then I stop, quest or play another game.
I play planetside 2 as well and it has similar style of PVP.
Of course I would prefer to learn to be better and progress in ESO's PVP but I can not compete with this bug.
As I said once it get's frustrating avoid it and do something else for now.
Once this bug is fixed the PVP should be worth doing so try to ease the frustration as much as possible.