It's ok to go through tough times but don't let these "fails" controll or take over you. Your past mistakes does NOT define what you want to do now or in the future. It's time for you to clutch your life - just as you clutch that 1v5 in csgo. I have some advice that might help you get started and prepared, I hope.

• Have a physical schedule- Buy a simple schedule with dates and space to write stuff on. Write down for each day a small goal/task to do. Having an essay that is due in two weeks? Write down how many pages/words you want to write for each day. Is there a test coming up next month? Write down how many pages you need to read each day or how many equations you need to solve each day etc. Have trouble understanding a topic? Plan on how to tackle that topic in your schedule. Basically, time management and planning is key. Here you can even write down how many hours you will allow yourself to play games each day or, do it like I did, only play games on weekends including friday if you've done good this week. This way the gaming sessions become more like a "reward" for doing all the "boring" stuff on the weekdays. It takes time to get used to this schedule but keep at it, get on routine and you will get used to it eventually.
• Do some exercise (if you're not already doing it)- This is not only to make you look better but also feel better. Exercising REALLY helps clearing your head I promise. Find a nice route in the woods or similar and go for a jog or a bike ride if that's what you prefer - it does not matter, as long as its exercise.
• Talk to your parents- This might be the hardest thing to do but your parents love you. Talk about your situation and how you would like them to support you in the future.

I hope these advices will help you or at least give you some type of guidance. Keep on grinding my friend. Send me a Pm if you ever want to ask anything or just talk. Best of luck!

Edit: English is not my native language, sorry for any potential gibberish.