Yes, I have very recently felt this way. Especially when the people you think you can talk too just leave you behind as if everything you had told each other and the memories you both had did not exist. I feel invalidated and disregarded by a lot of people, infact this feeling only adds fuel to the fire.
You can look at life in as many different ways as you'd like but at the end of the day we're all just sacks of meat being controlled and told how to behave. When we don't conform society will think we are insane or abnormal. That is why this site exists after all, if everyone believed that we have our right to die then there would probably be easier ways to kill ourselves. But that isn't the case and it won't ever be. Instead I'm just going to be known as the quiet kid who killed himself. I'll die, people will front at the funeral and after a few weeks I will be forgotten about and added to some sort of death tally. "Ope, there goes another one."
Life is shit, people are shit and we're slowly driving ourselves into the fucking ground anyways. Forget the sun, we'll kill ourselves off with our own stupidity.