I'm in high school right now, the so called 'friends' you have to be grateful for most likely secretly hate you, everyone just uses each other because that's what you do in high school, why the fuck should I be grateful for that?
and define picking on someone. I've gritted my teeth since the first year I started high school, and it's driving me insane,

You know some people have serous problems like depression and anxiety. One of my best friends killed himself because he kept getting bullied. So ya I'll make sure to tell him to suck it up.

been there, almost did it myself freshman year, but then I realized high school is the beginning of your life, and I wish your friend had came to the same conclusion, but all in all it's not even worth complaining about, and the more you complain, the worse it gets, want to enjoy your day at school more? get involved in class, look forward to the good parts of your day, don't watch the minutes count down thinking how much you hate being here and your next class is even worse, everyone has to do it, everyone fucking hates it, and everyone wishes their high school life was/is easier, so that's why I get a little worked up when people whine about high school shit

You obviously never went to catholic school.