I procrastinate a lot and I'm incredibly lazy. I also cut my nails with my other nails as opposed to biting.
I think the worst habit that I have is that I constantly lie in order to achieve something that I want, but it always fucks me over at the end. At least now that I'm much older, even if it's just a few years since I've told my biggest lie, I have controlled myself more and more. I don't mean like little white lies, "Oh, I didn't break that vase" or some crap like that. I mean lies that can affect the way a person views me. One of the worst things that happened to me due to lying is the loss of a friend around last Summer. I told this friend the truth about a lie I told them YEARS ago that I always brought up in conversation to make them like me more and to feel more accepted. Right now, that person probably wants nothing to do with me. At least I can use this as an experience to get rid of my habits as a chronic liar.
So far, so good.