No, it's not just you, it's the majority of people.  
Sometimes hypocrits like to call people out on being "lazy" or "destroying the environment" by driving their car, rather than walking/biking.  These people are jumping to conclusions about other people's lives, and making unfounded assumptions.
Riding a bike to work for me, would be inefficient, impractical, unrealistic, and downright impossible on most days.
a.) I dress up for work, i do my hair, i wear make-up.  Riding a bike and getting sweaty on my way to work, is not an option- we do not have showers at work.
b.) I carry lots of things to and from work (lunch, files, purse, day planner, stuff pertaining to errands I can run on my lunch break)
c.) I run errands on my lunch break- something I would be unable to do without my car- especially when it's getting my oil changed.
On another note, you cannot possibly know the route from my house to my work- certainly not enough to know whether it's even bikeable. Not to mention, it's impossible for you to estimate the time it would take, seeing as you don't know the terrain.