what's going on here?

i use different behavioural sets/patterns(for easier reading, i'll use the word "personalities") in different situations in order to achieve my aims and objectives.

when wearing green, i act as how men in green should act; i aim for detail, precision, and more importantly, speed. so it's just one objective after another till i'm done. i care not for things that do not benefit me or get me closer to my objective and more often than not, i throw these things out the window before they even get to me. i am careful with my words and think through conversations in my head again and again and again until the moment of the actual conversation; at this moment, i hope to have covered all possible scenarios that might occur. such conversations do not have life within themselves and are often dull; and when something out of the ordinary is said, the surprises are often unpleasant ones.

but on the flipside, there's an easy-going side of me that likes to live in the now; a no worries, laid-back and all kinda personality. this one is confident about speaking and knows how to find his way around conversations, is not highly strung(unlike the former), makes a conscious effort to get to know people better through mindless banter and utter nonsense, spends a great deal of time thinking about all kinds of things but doesn't commit to the first idea that comes to mind; he speaks freely and without restraint.

the unusual thing is that both of these are my Selfs; they are both within me but when left to wander freely, they are like a battle within my body, a paradox of sorts. how can one be so uptight, while the other is so relaxed and laid-back; all at the same time? the thoughts i think are often hazy and belong to neither of the Selfs; they do not aid my being. now i often find myself speaking hastily, only to end up correcting myself seconds later; there is this confusion within myself. my train of thought is one that travels on crooked rails; and many a time has it been derailed by my confusion.

then now, the question is this, how can i achieve consistency? how are others able to have a "one personality fits all" scenario? i have seen friends do it and their answer is to be yourself. but what if i don't see it in my true Self to be able to accomplish the tasks ahead of me? how do i employ my other Selfs i have within me? how do i maintain a clear head and full control over them?

on a random note, is it just me going crazy, or do these "personality clashes" happen to others as well?