Unless you have a place to shower and change at work or wherever you go, biking is utterly impractical. That's also assuming you have a safe place where to leave your bike, and that your commute is like 10 miles or less.

Not true. There's no need to shower after a short trip. Or even a 10km trip, if you don't exert yourself too much. But fortunately many offices do have showers. Also, bike locks exist.

There are millions of people who find cycling incredibly practical, so claiming it's impractical for some easily debunked reasons only shows the limitations of your experience. But you can fix that. Give it a try.