I am reading your post and at the same time i am laughing.
In this expansion of WoW, Ret paladins DOESN'T STAND A CHANCE in 1v1 vs shadow priests, frost or fire mages, affli or destro warlocks, ele shamans, enh shamans, boomkins and feral druids.
They are your counter that's why you cant beat them in 1v1, and you said " Sometimes i spamm the arcane torrent button " you can't spam arcane torrent it is a 2 minute cd, how can you spam it? hahaha!!!
Decent Ret Paladin vs Decent Feral Druid, the feral wins here.
Decent Ret Paladin vs Decent Enh Shaman, the enh wins here.
And the casters are just your counter, nothing to worry about.
Don't worry and play your game dude.
Regards.