1. Try to fill up that time* or try and think about other stuff.
* Go watch youtube, read a book, write a fanfic, climb a tree, whatever it is that you find interest in. Or you know, look for professional advice, not advice provided by a 12 year old that decided that she wanted to give advice.
2. Primates are social. Humans are social. Go socialize, if that makes you any less crazy and lonely. Or keep hanging out on Arocalypse, we can be a nice community when we need to.
3. That, dear human, is probably not my job to answer. But you probably could have been and still might be able to be saved by things like hobbies, friends, or therapy if that's what you need.
4. Welcome to Earth and the Unforgiving Human Society. Humans must always have their scapegoat to put the blame on. And about the past, humans also seem to have trouble letting go of it.
Some think about it like this: You aren't changing just for yourself and/or a few others, but as if you could influence people around you to change as well. I have also seen acting as if every day is your last.
Humans are bad, Humans are mean, Humans destroy planets, but (most) Humans have a moral compass. People care a lot about a lot of things. Also, therapists are paid to care.
I know I have referred to the human race as if I was not human, but don't worry, I am undeniably human, that's just how I speak (and type).