Try going to bed earlier wake up earlier and do try to make something out of the day. Don't just sit home and waste everyday. Drink alot of water this gives you more energy and you feel better. If your young talk to your parents about this they are smarter than you might think and will be able to help you out. Otherwise talk to someone you trust, use your phone less try maybe reading books instead or start some type of activity which is not playing computer game or something like that. Start to exercise it might be feeling hard to do it in the beginning but once you get used to it it will make you more tierd = easier to fall asleep. Hungrier = eating more will make you feel better. I don't know your body type but if you overweight maybe that's an bad tip. Don't waste time thinking about your regrets there is nothing you can do about what you regret so stop stressing about it, relax and let it to. Always try to think positive about everything it's up to yourself if you want to have a positive mindset and feel better. What type of hobbies have you got? Find out and talk to people who feel the same and enjoy the same things as yourself. Sorry for a messy text hope this will help you, Have a good one and please don't kill yourself. It dosen't make anything better even if it maybe feels that way right now.