Dude, let's take a chill pill (probably the worst piece of advice, ever).
Let's track back a bit. You said your parents don't care about you- but your grades? Yeah lmao, parents f**king suck, but let's look at their POV. If they never cared about you, you wouldn't even have a computer or mobile device to chat on IMGflip, let alone on the internet at all. You would have been disowned and probably homeless. I know they're angry and all, but look kid .. there's always food ready on the table every single day. If they never cared, they would never yell at you about your grades, or anything about you at all. Your education *IS* important, and I bet literally any parent would yell about grades (mine do 24/7). And sneaking out? Not all parents are perfect, as they might have not seen you at all. You're not a brat, nor are you stupid. This is all the process of maturity, as you'll learn how to handle stuff like this. I advise for you to see an actual therapist - or you're free to DM me about venting. I may not be on everyday, but I'll always read your vents. I'll try my best to give out advice, but know that I'm not perfect. I make mistakes and I fail. I'm not even good at making friends.
For now, find a perfect alone spot and do something that makes ya chill. Drink cold water, and breathe in. Hold that shit up for 12 seconds and exhale slowly. It's a breathing technique my dad usually tells me.. and it works. I know I can't relate to you, nor can I actually put myself into your shoes- but bottling shit up isn't healthy. Talk to someone who'll listen.. and even if this kid doesn't - there's a jifajfiaiillion others who will. Again, your parents lecture and ground you because they want what's best for you. They want to direct you to the best path, even if they have to yell at you for it . Tomorrow, they might calm down and stop acting angry. Most parents do.. So don't give into despair just yet. Just breathe.
`` 이것 또한 지나가 리라 `` (This too, shall pass). It's a korean saying that was used across generations. This too, shall pass. There's always a better day waiting for you. It ain't today.. but it aint gonna be like this forever.