Not a lemon/lime; no true lemon has a winged petiole as your leaf does. Try crushing a leaf and smell it. Without more info, I would guess it is an orange that is not yet ripe.

No idea...but my first guess was a Seville sour orange. The leaves look a lot like mine, but as John said, most oranges have leaves like that.

Here is a picture of the bloom this past March. It smelled very fragrant and smelled sweet.

I've crushed a leaf as suggested by John. It has a very sharp, kind of spicy smell. It reminds me of a citronella candle but I'm still not sure. Last year, we allowed the fruit to turn a yellow orange and when I cut it opened, it was very bitter. I appreciate all yalls help!

rootstock maybe.

Look up images of Seville sour orange and compare. That fruit is bumpy like yours...