Feeling alone no matter how many people around me

Hello Gill @Gill53 and welcome to the community. Good to have you with us.
It's likely to be a bit quiet at this time of day, but you'll find any number of members here who can relate to your 'aloneness'. I can myself, though from a very different cause.
Some of it comes, I think, from feeling and knowing things - it often feels like knowing 'too much' - that you can't really share with those around you. It's not necessarily because they are unkind or uncaring, but simply because you know it is beyond their comprehension. Sometimes one bottles it in because one knows that the reactions of others will simply disappoint, sometimes because one doesn't want to inflict the pain of knowing on those we care for.
Whatever it is it is very real. I hope contact with some of our very many members will help ease it for you. You're safe here and need hold nothing back.
Very warmest best wishes to you,
Here and listening,
Richard