paranoia is not uncommon,and playing with other Dm's has its benefits,but if you have a good Dm the point for him is not to manipulate the party,it is to tell a story based on our actions.
Good GM's are hard to find,so if you find one try and keep him/her.
That is something I haven't thought about. I guess in some ways it reflects what I might do in a certain situation but not all the time sometimes its just me trying to show what the character would do.
This is why my games are never the same. I have had a whole scenario take place inside a cities walls due to the way the characters went. A good DM lets the characters play and fills in the stuff around them to include consequences for their action in the market or the Inn.
When our group consisted of a couple friends and my cousins and aunt, I noticed, and later, upon urging by the GM, really started paying attention, to how each player would, on average (given different characters they played) still give a fairly accurate portrayal of that person's real-life persona, including their destructive and anti-social habits, and their more beneficent tendancies. We could tell who had a quickly emerging dark and rebellious streak, who's interest was pure control, who wanted law and dicipline, etc. It was quite revealing for everyone - regular players who immerse in play and tend to be very creative though, are much harder to pin down this way because they use a variety of emotions and personal dynamics, as well as incorporating things they've seen in other player-characters and movies and books, etc and so can weave a much richer, more removed-from-themselves character.
I have noticed a few players that were unable to separate their persona from their character. With this problem you get players trying to 'intellectualise' what should be a character with a low IQ.
I will like to add in my bit... Your fictional character can be an expression of yourself or an extension of yourself IF you had those abilities. Of course if you believe you DO have those abilities then that is a problem.
What Fairmaiden is saying is even more true when its a character you start off the way you want it. If its a random character though you might like totally struggle to bring yourself into it so that's where role playing comes in.