My rifle (S-AEG) doesn't fire anymore?

Good evening, morning,

While I was out playing today, I encountered a small problem. In a tricky situation, I was playing tactical and tried to quickly change my magazine. Apparently, it wasn't fully inserted, because I jammed a bullet and my gun wouldn't fire. When I removed the magazine and fired again, three to five bullets shot out of the barrel at once. Now I regret that action, because since then, my gun has only been making a "click" noise, like something is stuck in place that isn't.

Does anyone have any suggestions for solutions or have had similar situations?