English expressions

Not the end of the world
Meaning: used

for saying that something bad is not really as serious as someone thinks it is.

Examples:

It would be great if I got this teaching position, but I guess it isn't the end of the world if they pass me over.

I've enjoyed my time in international football, but it won't be the end of the world if I'm not selected again.

You need to know that it is not the end of the world if it doesn't go your way.

Not the only fish in the sea
Meaning: Not the only suitable thing, opportunity, or person one can find.

Examples:

I know you are broken up about Janet leaving you, but she's not the only fish in the sea.

I'm pretty disappointed that I didn't get the job, but I'm trying to remind myself it's not the only fish in the sea.