The right thing?

Did I do the right thing by taking up the job offer? Or was it simply taking the easy way out of not making the CV for the finals or of going through the tedious process of dressing up in formals and attending sleep-inducing presentations given by companies who would be coming for the final placements?
I know I love a proper corporate kind of a job, and I am not at all interested in finance as well. For the time being, talks about capital markets, shorts, puts, derivatives, vols, etc make my head go dizzy. I would love to do marketing one day, which involves much more customer interaction, which is more of common sense than technical knowledge. But then I also know I cannot do sales, and the first step to a good marketing career is knowing how to be a good salesman.
I am just so confused as to what to do in life. I have never loved money, have never ever drooled for it. They rightly say - 'A good finance guy is the one who loves money'. I am not the ambitious kinds either. All I want is a decent quality of life. I do not aim for the moon. I know I should, but I don't. I am not at all driven, probably cause there is nothing which drives me - neither money, nor power or position. I am in love with mediocrity, and somehow I have developed this notion that people who are average in their professional lives are the best ones in their personal lives.
That is why I am scared, scared to go join the company I am going to join, cause I know I will be surrounded by people who would, in all probability, be smarter than me (did I tell you I was a pessimist? :P), people who would be thousands time more interested in debt and capital markets than me, people who would be motivated, spirited, enthusiastic. And I would feel lost, completely lost.
Maybe I am just being too negative, but I AM worried. :(