When does Hamlet criticize himself about not taking action?

Throughout the play there is a multitude of times where Hamlet criticizes himself for being indecisiveness in avenging his father's death. The strongest speech that he gives about this:

"O what a rogue and peasant slave am I!...

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Yet I a dull and muddy mettled rascal peak like a john-a-dreams unpregnant of my cause and can say nothing no not for a king upon whose property and most dear life a damned defeat was made. am i a coward? who call me villian, break my pate across plucks off my bear and blows it in my face... ha! swounds i should take for i am a pigeon livered and lack gall to make oppression bitter or ere this i should have fatted all the region kites with this slaves offal. bloody, baudy, villian, remorsless, trecherous, kindless villain! O vengeance. why what an *** am i. this is most brave that i the son of a dear father murdered prompted by heaven and hell to my revenge must like a whore unpack my heart with words and fall accursing like a very drab a scullion fie upon it foe about my brains!"

in this speech hamlet is basically saying that he is a coward that has been unable to avenge his father. he sees that since he has not carried out his revenge he is as thou the bieng the villian himself. he mocks himself and says that he has been prompted or ordered by heaven and hell, referring to the ghost, to act revenge and all that he has been able to do is say words when he says "and like a whore unpack my heart with words".

there is also another famous speech when Hamlet sees fortinbras and his troops advancing tpwrds war. he says:

How all occasions do inform against me,

And spur my dull revenge! What is a man,

If his chief good and market of his time

Be but to sleep and feed? a beast, no more.

Sure, he that made us with such large discourse,

Looking before and after, gave us not

That capability and god-like reason

To fust in us unused. Now, whether it be

Bestial oblivion, or some craven scruple

Of thinking too precisely on the event,

A thought which, quarter'd, hath but one part wisdom

And ever three parts coward, I do not know

Why yet I live to say 'This thing's to do;'

Sith I have cause and will and strength and means

To do't. Examples gross as earth exhort me:

Witness this army of such mass and charge

Led by a delicate and tender prince,

Whose spirit with divine ambition puff'd

Makes mouths at the invisible event,

Exposing what is mortal and unsure

To all that fortune, death and danger dare,

Even for an egg-shell. Rightly to be great

Is not to stir without great argument,

But greatly to find quarrel in a straw

When honour's at the stake. How stand I then,

That have a father kill'd, a mother stain'd,

Excitements of my reason and my blood,

And let all sleep? while, to my shame, I see

The imminent death of twenty thousand men,

That, for a fantasy and trick of fame,

Go to their graves like beds, fight for a plot

Whereon the numbers cannot try the cause,

Which is not tomb enough and continent

To hide the slain? O, from this time forth,

My thoughts be bloody, or be nothing worth!

in this sppech hamlet sees fortinbras and his troops that ready for war. here he realizes that he not a worthy son as he can see that a troop of more than 20 000 men risk their lives for the most meaningless of earnings and his father has just died and he cannot commit the act of avenging him. unlike the previous speech hamlet here does not entierely scold himself for not acting out his revenge. after seeing the troops he is motivated to meet the goal that he has aspired to acheive where he says "from this time forth my thoughts be bloody or be nothing worth"

~hope this helped