Struggling with a two year old

I never imagined how hard having kids would be, I guess no one does until they have them but having a two year old Ollie I now know why they call them terrible twos. 

I used to be a calm, patient, quiet person but omg that is not me anymore. Every day Ollie tests my patience and he pushes it so far I end up shouting to the point my neighbours would hear me very clearly which I hate as they probably think I can't cope. 

He just doesn't listen even when I shout he laughs at me or carries on hitting or doing naughty things. In the end I just have to leave the room to get away from him before I burst.

Tantrum????

I just can't believe how much it has changed me I don't actually like who I have become. I moan so much more about things I just didn't care about like people parking across a pavement so I can't get my double buggy through. I shout - that I never did, I swear - I used to hate swearing or hearing it with a passion. I'm now angry, fed up, and get so frustrated with mess.
I'm longing for quiet and time to myself. Even just to tidy the house.

Anyone else out there who feels this way or am I just rubbish playing mummy?