I am not a violinist, but I am an amateur pianist so yes I know a bit about instruments. I also played a little bit of violin (tried it for a couple of months for fun).
Left or Right handed does not really matter in the long run if you got a teacher who knows how to instruct a left hander. I know someone who could play violin okay despite being a left hander.
I do not know what is a left-hander violin, a violin is a violin and you should not go for stupid variations - that would only make your life harder as most teachers use the "regular" violin. And violin is immensely hard to learn without a teacher.
Violin is an instrument that require an extraordinary dedication to the instrument. Your tone would suck in the very beginning, your parents/friends/relatives won't be able to tell whether you are butchering livestock or making music, and your neighbours would want to murder you for messing their ears up. But worry not, you WILL get better if you keep going on, and it is very rewarding (and definitely something to be proud of) to be able to play an instrument well as it shows every second of effort and love you put in your instrument.
Still, it depends on your goal, if you want to become the greatest violinist on planet earth, probably you should kill that idea if you are over 10. Remember, making music, is the ultimate goal of a musician, not showing off insane skillz (though that is a part of ...haha).