Riddle Me This

Ok peeps, someone explain this to me, because I obviously don't get it.  Why are bad habits so freaking hard to break?!  And, further, why are good habits so hard to stick with?!
For instance, the good, the bad, and down-right ugly:
Nail-biting-- I have been a nail biter for as long as I can remember.  When I got braces back in the day, my orthodontist told me that it's very difficult to bite nails with braces, so I would more than likely just stop.  Yep, guess who figured out how to do it anyway? ----> points to self <----......
Healthy eating-- I've been so much better about this the past couple of weeks, but, seriously, an Arby's Roast Beef or Big Mac sound waaaaayyyyy better than my carrot sticks.  I'd much rather have Mac sauce all over my mug than greek yogurt...just sayin'.
Exercise-- Does Wii bowling count?!?!?! Seriously, I have a plan in place for this, but, since I'm being totally honest here, it's so much easier to just not to do it.  I'd rather sit on my ass and eat cookies.
Grooming-- Ok ok, don't jump to conclusions here folks.  I groom myself in the sense that I take a shower everyday, wash my hair/body/face everyday, brush my teeth, and all of the other necessary stuff.  But, I am horrible about getting my eyebrows waxed, getting my hair all did, and remembering to apply face cream at night.  Hell, I don't even wash my face before bed.   I know, shame shame, tsk tsk....whatever.  I am tired at night.  Just refer to me as Ethel, and 85 year old that would prefer to go to bed at 7pm and regularly forgets this kind of crap.
Double dipping-- You know, with chip dip and other snack time goodies?!  I only double dip with my own dips/snacks in my own home, because the thought of doing it elsewhere makes me gag, but, I am not sure the fact that I only do it at home with my own shit makes it ok...?
I just painted a lovely picture of myself, eh?  I know, I know, epitome of awesome right here. 
Bad habits are hard to break, that's for damn sure.  But, it's worth the effort in the short run and the long run.  It's time for me to get with the program.  I've been too busy not caring, and it's time for a change.  Easier said than done, I know, but, it's a long time coming.
Do I have you all convinced yet?  ;-)
...I still want a cookie by the way.
Happy Monday!  Tomorrow, you can catch me chillin' with miss Jillian while she kicks my ass with the 30 Day Shred.  If you don't hear from me, no worries.  I'm just passed out on the floor, or writhing in pain.  One of the two.... ;-)  Kidding, kidding. Maybe.
Bye!