Why do people act like those who DON'T drink, are defective?

Like they aren't an adult unless they go out and get drunk every weekend.
Why can't I just live sober?
I don't have anyone to go drink with.
Even if I did, I cant depend on anyone but myself to keep me safe.
I can think of so many things that can happen.
What if I mis-jusdge how buzzed I am (never drank), then get in my car and hurt someone?