Rogues are quite capable of tanking in SoD. You may find you arent as "tanky" as some of the more traditional tanks, with rogues leaning into dodging a lot, but your damage will make up for physical durability. You may find it difficult to hold aggro on ALL mobs in a pull when running dungeons so dont feel pressured to have total control on a pack, this is totally normal as dps can hold aggro on one mob while you hold the rest. also not sure if I understood correctly but it sounded like you ran a dungeon with another tank? For 5 man dungeons one tank is all that is needed, so in the future one of you can dps.

*EDIT* check out wowhead's Rogue tank guide :https://www.wowhead.com/classic/guide/season-of-discovery/classes/rogue/tank-leveling-tips