How do you talk in a group so people notice you?

This is aimed at people in the Uk because I think Americans might be different. I find over and over in social groups that I can't find a way to be part of the group, I listen to other people often discussing the most mundance stuff and I've kind of learnt how to find the moment to pitch in but so often people just go 'oh' or even turn their back and start talking to the person next to them. I'm getting lower and lower in confidence and self esteem. I guess I've tended to make friends too with people who are talkers and I'm a listener. I don't mind being a listener but this year two people I thought were friends just got really snidy and then walked away when my life wasn't great and I wanted to talk to someone about it. It's making me really depressed and thinking that there is something wrong with me but I look in the mirror and I look just like everyone else. I just don't know what to do or how to move forward. Anyone got any ideas before I think there's just no point in going on?