Stars 1/2 - AA 3 way vs a lot of action

[JSampras1]

Smurph thinks i'm an idiot who should be playing .05/.1, so I don't know why he's even bothering giving me advice when he already wrote 2 1000 word posts about how my game is absolutely terrible and there's no reason even asking advice.

But anyway, why do i want to lead here? If it goes bet/raise behind me I save money if i don't bet. If i bet and it's raised, unless i'm bet/folding i'm just putting more money in the pot where if i'm not behind now a ton of cards kill my hand. I'm almost sure someone will bet anyway, and i would rather see the river for 1 bet than 2, especially because the diamond kills my hand if i'm not beat already.

Maybe i'm just awful, but i really don't see how leading that turn is good.