I hate people.

Well, my friend - I don't think it's people - I believe it's you, and in fact, I even have a mathematical argument for you. At your age, you've probably had at least a couple 10 thousand interactions. And given the average 18-year old or so experience of having had a few by that point, the probability that you haven't had any pleasant/good interactions is extraordinarily slim. Slimer still if you're saying that they've all been bad.

I think you're probably looking at your bad interactions too critically and your good interactions unappreciatively. Try to feel good about the good things that people do for you - like taking care of you, paying for your education, hearing you out when you've got problems, having been good friends up until they disappointed you, etc.

And as for the world entire, as humans we tend to be more interested in tragedies than in triumphs so we tend to focus on those things (look at every story you know - there's always some tension/adversity for the protagonist that holds out interest) But there are many big and little things that we do for each other each day that when described ends up sounding kind of kitschy, but ultimately, I think we do ourselves right enough to earn our right to exist.

Jam it back in, in the dark.