I need some tips.

What is almost the most anoyingest thing to me in the world is awquard convos or convos I can't keep up in because I don't understand what they are talking about. I'm not talking about 1 on 1 convos. Those are easy to get into because you can just ask questions to the one person, but when its 3 person convo. You have 2 people talking about a convo that the 3rd person has no clue on what the fuck is going on. To me if I am that 3rd person I feel quiet and I shouldn't ask any questions because I guess I'd feel rude. It is how my character is in these situations. The fact that I'm trying my best to actually get invovled to but still get shoved out of the convo. I try opening a new topic, I try asking questions but then it just goes back to normal and then I feel as if I should leave the convo because I just don't feel welcomed anymore. I hate how I am like this and I seriously want to fix it. So if you have any tips. Please drop em by for me! =D