So obviously you are a minor if you really think that's how it works. He said he doesn't wanna play pvp with them anymore. He never said anything about them not being friends now. Jeez

But sucking at a FPS is a personal preference. All you have to do is simply play alongside your team consistently and you will naturally do at least "okay." Start with this then you start getting confident and cocky and start making plays. You consistently start making plays your getting good. Now you are able to think further outside the box and make more plays sycning your play now better with others. Now your getting better and better climbing the elo latter keep it up and the sky is the limit...