It’s not essential to get married, whether you want children or not (I don’t plan on having a husband or children, either).
Marrying someone else doesn’t guarantee anyone a better life than staying single, though some would lead you to believe it does - you can still be lonely, financially poor etc, especially if you happen to end up with someone who is, to put it bluntly, deceptive in some way but hides it well.
People who judge others for not marrying/having children are narrow minded and might even feel threatened in some way by others making different choices than they did. But that’s their problem, not yours.