i just made a new character on WoW a bloodelf death knight n i did quest and yeah. i wanted to explore but when i went far enough my death knight wouldnt go on + im getting bored of staying there cuz i already done 20 quest n i wanna go somewhere new.

You may have more quests to do. The DK chain is fairly long, depending on the person. Check your quest log and check the area to make sure you don't have more quests to do.

you got to finish all the job quests in order to leave.

it's just like how with worgens you gotta finish the long quest line to get out fo gilneas and do dungeons, etc..

if you dont do them all you wont be allowed to leave EVER.

You gotta finish all the quest in order to get out trust me i had that problem my first time i made a death knight.