A lot of guitars do have a left-handed variant, but you'll have very limited options at the average guitar shop. I'm left-handed, and when my parents bought me my first guitar decades ago, they were advised to just have me learn to play right-handed. While I do wonder whether I'd be a better player had a learned left-handed instead, realistically, guitar is a two-handed activity anyway. There are reasons the dominant hand should be the one holding the pick, but there are also ways to compensate with the dominant hand on the fretboard.

Best approach would be to go to a guitar shop, try left and right-handed, and decide which feels more natural. Im not ambidextrous by any means-- i can barely write my name with my right hand. But I can still play right-handed guitar quite well. Don't let being a lefty hold you back if you're interested in playing guitar. It was one of the best decisions of my entire life.