You can just move your keyboard a bit to the right and play like normal lol... Or use ijkl or whatever

I'm completely left handed

I phrase it like that because my right hand is fucking useless at most things, I've broken my right arm 3 times - I did martial arts and was clumsy.

That being said my right arm is not impared at all, it's just I got better at doing things my right hand did with my left because of the time my right hand spent in a cast of recovering from a break.

BUT i do use a mouse in my right hand, I'm not too sure why but it feels more natural.

Ambidextrous master race! Well, I'm predominantly right handed by habit, but due to a screwed shoulder I often have to do things left handed including gaming.
TBH It's the keyboard that causes issues when playing left handed.

Silly fact - in 08s UK the joysticks we used were geared for left handed play. Was a nightmare switching to right handed controllers

I'm not exactly left handed myself, but from experience when I was fucking around, I found using jkl and the keys around it are the best places to put hotkeys on. Numpad also works really well as an extra for games that require more hotkeys - Starcraft, Battle Realms, Warcraft - those kinds of games.

Exactly. I also use the mouse in my right hand because it feels comfortable. When I use it in my left hand, it just feels strange. Using the IJKL keys are also not my cup of tea.
-----

Wow that's sad man, I'm only predominantly left handed. It must really be a hard world to live in for you.

I'm a lefty but I've always used the mouse with my right hand