Advice on how to make me happy again?

I don't know why, but since going back to school this year, I feel like an outcast. I speak to more people than usual and I know I have some great friends, but deep down I feel empty.

I'm in Year 10 / 9th Grade, and at the moment I have 4 really close friends, all girls. They aren't in all of my classes, but at least one of them is in my class at a time. My first problem is that they all speak to boys! 3 of them have boyfriends and the other one speaks to a boy who likes her. I feel a bit left out with that I suppose? Boys have said they find me attractive and stuff but because I'm shy, it never goes any further than that… What can I do to buck up my confidence or talk to more people?

Next, yesterday I was invited to a chat with my 2 of my 4 friends, another girl (her names Ellie) and 3 other boys. We were all talking and laughing and that and I felt quite happy! Then Ellie was trying to sing and everyone was bored and my phone rang but I couldn't find it, so the iPhone marimba tune was going off for abit. I answered the call, looked up at my laptop and noticed that Ellie had kicked me out of the chat. I asked why and she said "Nobody likes you anyway, we didn't want you in it in the first place". She then kicked my other friend out, and left just 1 of them in the chat with her. I feel like I'm drifting away from everyone. Any advice on what to do here?

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