I can't be bigger than my old habits.

Well I guess it's true.
I can't be bigger than my old habits. I also can't shake them either. So someone tell me why as humans do we find it so hard to let go of certain habits or behaviours? Why can't we recognise they are bad habits, and just change for the better? Why is it so difficult? Is it because we are so comfortable or maybe because we are scared I don't know.

Here's a few of my bad habits.
-I swear
-I drink, often too much too quick.
-I smoke when I'm stressed
-I kick things
-I make myself sick
-I have casual sex that means absolutely nothing to me.

These habits are hard to shake. I'm a reckless person, No I was a reckless person. I'm trying particularly hard to be less reckless. I'm learning to care. I'm trying and succeeding in cutting down on my drinking, I havent had a cigareete in months. I'm still working on the whole casual sex thing. I have made myself sick once in the last month or so. And I threw a bin instead of kicking it. :)

I'm trying to be bigger than my old habits. I am truly trying.