Have you ever gotten so mad at a game that you take it upon yourself to trash talk even your own team!? Though rage is normal and can be an overwhelming emotion that occurs a lot especially for those just starting to get into the competitive scene, it's something you really need to recognize and reset. Best thing to do here is take a break! I know I know people tell you you need to put hours on end into it to reach that level of play. However, time played doesn't mean anything if you just yell at your screen all day or blindly run around. It is imperative that you practice the right way and rage simply just clouds your judgement. At the end of the day improvement comes from a level headed individual focusing on the right aspects of the game. Not the lag, the teammate running in over and over, or even the fact you're getting spawn trapped.
You are the best you!