..what am I still alive for?

I don't feel as if there's a need for me to be here anymore. My group of friends is split, I'm always jumping around trying to fit in with people and it's not working out. My own closest friends are dating each other and I barely spend time with them. The most I've done was watch a movie with one of them and skyping with the other one twice and texting every day, that's it. Main point is, it was all behind a damn technology screen, not in person. And now I can't trust my sister anymore. My dad lectured me about not driving fast and then my sister, being the smart one that she is, told him that I did an 80 on Lawrence Expressway. I had no fucking idea what she was thinking so now I'm still pissed at her for doing it. Then now I come back from having lunch with my dad and then my mom starts yelling at me for something I should have done. My dad kept calling me his youngest son's name (who I don't consider to be related to me at all in any damn way, shape, or form) and I once complained about it to him but his only excuse was because I don't live with him anymore and he sees his youngest son every single day. What kind of bullshit excuse is that? It's completely 100% bullshit. Then just before break started, on Friday, some junior flipped me off and I didn't even know the guy in person. So now...I pretty much have nothing left, why bother living still? I just wish someone could shoot me in the head right now, I might be happier that way, I honestly might be happier that way...I'm so sick of my life right now I don't know what to do with it...I hate living this way. I absolutely...hate it.