Dont keep mixing the rice, it releases the sticky starch and makes it more sticky.

I add some vegetable oil to the rice whilst it boiling as it helps stop it clumping together.

Splash of Olive oil, vegetable or chicken stock and a chopped garlic clove. Boil. Once its cooked (and drained if you used to much water) I crack an egg into it and stir, the egg cooks instantly with the heat of the rice. Delicious.

Buy a rice cooker. Perfect rice.

I got a ceramic hob so it keeps the heat it a bit easier.. But i take any pan... Put the rice in it... what ever amount i need.. And then pour cold water on it to about 1 inch above the rice level.
Bring to the boil... switch it off... and leave it to stand with lid on. I don't take lid of for about 10 minutes. Then i fork it loose with a fork (surprisingly)... Lid goes back on for five minutes more... till serving i suppose.
I use Basmati rice. And it doesnt stick at all... leave it too long without forking it it will get lumpy then.

Good luck

Does anyone add carrots and onions to their rice? Mmmmmmmm!