Am I being unreasonable not to want to go to the pub??

Thank you all for your wise words!

Can't see what's unreasonable about doing exactly what you want and within your comfort zone. I take it someone is badgering you since you feel the need to ask this?

Don’t think YABU so long as you don’t try to encourage others nor to go. Personal choice. Accept they are going to pub and you don’t want to.

What is U3A?

I agree do what you feel comfortable with though, it doesn't matter what others think really

U3A is University of the 3rd age

granfromafar

U3A is University of the 3rd age

could you explain further? what do they do?

This may help JaneJudge
www.u3a.org.uk/

that looks like an interesting organisation

Thanks to Jaxjacky for putting the link. I joined our local group a few years ago but now I'm retired I seem to be too busy doing other things! There are groups all over the country so easy to find a local one.

Absolutely not, nor do you need to justify your choices to them or anyone else.

If you don't want to go, don't go! Simple as.
Don't make up excuses, just excuse yourself from going, say you're going home and if they ask just tell them it feels too crowded for you - exactly what you're telling us!
You shouldn't go, or be made or expected to go, somewhere where you feel uncomfortable!!
Put yourself and your health first!!