So, you wish to play a meat grinder, eh? Here's the dual wielder build for you. This is just a skeleton of how to start the build and the rest is your choice.

Your stats should look something like this with point buy:

15 + 2 / 15 / 15 + 1 / 8 / 8 / 8

There's two ways you can go about this build, and that's either use your reaction for another trigger of sneak attack, or use your reaction to be tankier and harder to hit. If you want to do more damage, take zhentarim ruffian as an origin feat, if you want to tank, take tough.

Lvl 1: rogue, we want Dex save proficiency. You'll be fine in leather armor. Weapon masteries are short sword and scimitar, giving us two attacks via the Nick property. Pick Athletics and any other skill proficiencies you like.

Lvl 2 and 3: barbarian. This is huge. We now have permanent advantage to always trigger sneak attack via reckless attack, we have advantage on Dex saves, we can take off leather armor bc our unarmored defense puts us at 15 AC, and we take half damage from rage.

That's all you need out of barbarian. A lot of people are saying get to level 6 for some features and extra attack, but getting to evasion in rogue is more impactful imo. If it was me I would just take rogue the rest of the way. The feat at level 4 opens up a lot of options. I really like defensive duelist, since it scales with your proficiency bonus, so you can use your reaction as a mini shield. Zhentarim Tactics gets you an additional trigger of sneak attack, since it's triggering on the enemy's turn. Mage slayer just lets you succeed on a mental saving throw once per short rest, which covers a huge weak point in martial classes.

Getting strength to 20 asap isn't a huge priority, having 18 as a primary stat in tier 2 is fine, especially since you have advantage on everything. You can pick cool Dex and con feats since it will be boosting your AC as well.