I can see where some of the advice is coming from, as far as being overly sensitive, or wanting attention, and etc, but while that is true of a lot of people, don't let it get you down. If you are a sensitive person you just have to be self aware, and maybe realize that if a room full of people (offline or online) aren't talking to you, then it's not always the case that they're actively ignoring you or disliking. In some cases they might be simply caught up in their own thoughts or a different convo. And it is extremely easy to be overly sensitive, or shy, or have crummy self esteem when you've been in situations like yours - I've been in similar spots so that's why I'm giving my two cents even if its a few days late!
Main thing would be to watch your temper (if you have one?), try not to be (or care about being) the center of attention, and kinda just go with the flow of the conversations you're in, or the people that you're around. It helps a lot to just kinda blend in, or if you're super talkative, try not to offend and say too much. It's also fair to say that no one else knows what goes on inside your head. So if you're freaked out, or shy, or feeling bad, or insecure and you're worried about what people think - no one will have a single clue about any of that, unless you tell them. When you walk into a room, for all anyone knows you could be the most confident person in there, and they would have zero reason to think otherwise! So if you act like you're keeping together, that's a step towards actually gaining said confidence!
I might have more I was gonna say, but I'll withhold, because I've only seen your posts around, so since I don't t personally know you, I don't want to speak outta line too much, but please take care, and I hope you're able to mend that friendship, or at the least that you can find some good friends in other people in the coming years. :>