As the others have said, you just need to get used to driving a stick. Your Kia has either a 2.0 liter conventional engine or a 1.6 liter turbo. Either should be adequate and the turbo might even feel peppy once you get used to a manual transmission.
That said, I want to focus on the vinegar smell. Most likely you have something in the ac vents that doesn’t belong. Have them cleaned out and the cabin air filter replaced. Run the ac and see if the smell seems to be coming from the vents. It’s also barely possible you have a leaking heater core, although antifreeze doesn’t really smell like vinegar. Check the front carpet and mats for damp spots.
Better yet, if you haven’t already, have the car inspected by a mechanic you trust to find any other possible issues.