I can't comment on the 'sweet smelling' aspect, but this looks remarkably like stinging nettle (Urticaria dioica) https://northedinburghgrows.wordpress.com/2014/07/21/nettles-a-very-useful-plant/. It's easy to tell if that's what it is, either by just watching how they develop over time, or touching the leaves, if you don't mind nettle rash afterwards. If you do touch it and it stings, leave the stinging area alone - you will be tempted to rub it or scratch it, but if you resist that temptation, the stinging wears off within 10 minutes, whereas if you touch or rub the area, it will continue to sting on and off for some hours. Apart from discomfort from nettle stings, the plant is not dangerous at all, in fact it's edible.
Here's another link describing culinary and garden uses for nettles https://www.gardenersworld.com/plants/10-uses-for-nettles/
Although I don't really think what you have is catnip (due to the gleam on the leaves), because it looks so similar, I thought I'd post an answer for it, in case it helps.
Catnip usually has leaves with somewhat smoother edges, but sometimes ours gets edges more like your plant's (except they're rounded and yours look sharp).
If the stems aren't square, you probably don't have catnip. Although I don't think the smell is sweeter than mint, it's possible that you might. It definitely has a smell.
Here's a picture I just took of some of ours. Our catnip usually has had flatter leaves with a more triangular shape, but a lot more of it looks like this, lately. It's furrier than the plant in your picture (when it's grown with more sun catnip looks even furrier), which accounts for the less shiny look.
Here's a shot of the stem of a different catnip plant in our yard (if your stem is rounded, it's probably not catnip):
Lemon balm also looks similar.
Both catnip and lemon balm are edible, unless you're allergic.
If your plant doesn't have squarish or blocky stems, it's probably not lemon balm, either. Both catnip and lemon balm are in the mint family, and things in the mint family tend to have blocky stems.
I do agree with others that it looks like a nettle, though, and I think a nettle is definitely the more likely answer. I don't have experience growing nettles.
I am guessing HENBIT, Purple Dead Nettle. Check out these pictures... purple dead or ground nettle