New Frost DK needs help

[:1]I JUST finished gearing up this DK, so I am pretty inexperienced with him. I know that Blizz doesnt balance 1v1, but I just have no idea what to do against ferals/warriors/rogues. especially rogues because I cant kite them through cloak. originally i thought that it was that resil that was the issue, but i have about 3.7k resil (not a ton, but should be good enough... right?) and i still get trained by these melee classes. help please :'(

ps. i am not sure why my neck piece looks empty on armory. I have a ruthless one reforged to mastery
/bump? :'(

but I just have no idea what to do against ferals/warriors/rogues.

Spam chains and run in the opposite direction.
Frost DKs will struggle against all 3 classes you have mentioned above in 1v1.

My advice against a warrior is to kite him as much as you can with Howling Blast until you have a full amount of runic power then pop tinkets and go to town on them. Save EMFH for disarm and Ice Bound Fortitude for throwdown.

Feral is a lot harder. You might want to use IBF when the druid opens on you so you have some damage mitigation at first but some times druids will anticipate it so use it wisely. Build up runic power to full then pop trinkets. Save EMFH for stuns or cycle. Death Strike when the druid goes into bear. Also save Anti Magic Shell for entangled roots.

Rogues I can't help you much with in 1v1 because once you pop all your defensive cd they will just run away and restart the fight again and you die. Use Lichborne to Heal and have ghoul ready to heal when you need it. Use Howling blast when he/she is using evasion and melee damage only during Cloak of Shadows. Save IBF for kidney shot and trinket for dismantle. Also, use Anti Magic Shell a second before crippling poison is off of you so it allows you run freely for a few second until it wears off.

Use Chain of Ice wisely and if you have desecration use to your advantage by move around in it.

I hope that help you out a bit.