Why do we do what we do?

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I've not posted in a long time. Recently I've been put up to the challenge of posting something in order to elicit a particular response, to be rated, if you will. That's a pretty tough challenge, it's like a date or a job interview--to say the "perfect thing." Okay, so it's easy for me to say why I'm writing this particular blog (or is it?) but that moves us right along to the initial question, "why do we do what we do?" I've been finding myself down a lot of contradictory, and sometimes outright stupid things lately--saying things I'll later regret, speaking aloud and voicing complaints in the workplace, flirting with some girls perhaps I shouldn't and pushing away some (that, too, perhaps I shouldn't), eat foods and drinking beverages I know I shouldn't on a debilitating (digestive and autoimmune-based) health condition, procrastinating (playing video games and over-sleeping), etc. I also do a few things that make sense now and then; confronting fears, getting to those things that I put off (you wouldn't believe how long I put this off), studying, preparing for my upcoming master's program, etc. For the moment, I won't focus on those things that I do that make sense (perhaps, here's a key to my most major problem, and the question at hand?), but rather I will return to doing those things that don't make sense? Why do I drink those sodas, sometimes multiple times away knowing that it's just pooring acid on my ravaged digestive system? Why do I say things that could haunt me? Why can't I keep secrets very well? What motivates us? Does my past reading of Freud and his eros v. thanatos theory have some bearing on it? Is it just too simple to say "we're creatures of habit"? Can you admit to your self-defeating behaviours? Can you share any of them here? Would you care to suggest why we do A)anything/everything that we do, in your opinion, and B)those harmful things? Thoughts? Please come forward and share.