Making rash decisions online

[Unknown Soldier]

(I'm not sure if this is the correct place to post this so i appologise if it isn't)

I play online poker mostly, and hardly any live at all. I believe that I am of a reasonable standard, but I
sometimes find myself making rash decisions due to the time limit of online poker.

Here's an example:
heads up in a 10 person $22 SNG. I have about a 4:1 chip lead. I call in sb (I forget my hand, but it doesn't matter) bb checks.

flop is K23 i bet 400 (bb at that point) representing a weak K bb calls (usually folds a flop bet unless he has something) turn J (I think) I check, so does he. River K my opponent has about 1600 chips left so i put him all-in. What a terrible bluff!! (he had 23 incidently) I would have never made that bet if i had more time. I realise that 30s is enough time to see that its an awfull move but a bluff seems to be more effective if done quickly, and in a situation where a bluff would be a good move it is less effective if you think for a while.

Which brings me on to another problem: when you take time to put your opponent on a hand figure out odds etc it makes you look weak, and are more liable to being bluffed at (in my experience).

Does anyone else have this problem? I guess experience is the only way to combat it?