So you're looking at yourself from a professional point of view. You're a raging fangirl, a complete geek, a classic rock snob, what have you – and you don't want to show it. After all you worry about how you'll come off at work, on the job, to clients, etc.
Chances are, it's backfiring.
The more you choke off who you really are, what you like, what you do – even if it seems ridiculous – the less you're going to act like yourself. Since you'll be busy being something you're not, you're going to screw it up anyway.
Your clients, co-workers, employer, etc. are going to notice this and notice something is wrong.