Hi there.. just know it's absolutely normal for teenagers to experience such mood swings, so perhaps it's not a disorder.. Probably the reason you feel depressed sometimes is because of any heartbreaks or not being treated as good as you would want from your loved one or someone special..
Just know expectations lead to hurt.. so probably don't expect much from the world... as an Old teen, i would suggest you to focus on yourself and those who care about you.. while if you care for someone who doesn't give a sh*t abt you, you'll end up being depressed.. So just surround yourself with people who would give it their all to be around you.. And cut off or maintain distance from others... If you don't have anyone who is as good it's fine too.. Be your own biggest admirer.. and have confidence that someday you'll find people who would make your world light up with joy.. but until they arrive you gotta do smthing on your own..
I have a few advices for you...
Find yourself a hobby & give time to it.. try to engage yourself in some physical activity like exercises and sports at least 2hours per week.. If you are on social media i would suggest you join Twitter follow people who inspire you ranging from entrepreneurs to sportspersons.. Spend time with your family every now and then.. it's at this stage generally kids get detached from their families and crave attention of their friends.. but if now you can learn how to live without attention you will grow up to be a better person than those who won't! Focus on your studies too.. Don't Just blindly follow the recent narrative on social media of studies being unimportant.. They are just as important as anything else that is glorified in the modern day world.. I hope you would have already made up your mind to decide some goal in your life now that you're maturing .. Work for that Goal.. All these bad days will pass and noone will remember.. You'll be known for the Great things you do.. know you are the best and work accordingly.. but never let the pride get into your head.. stay humble, stay nice.. but never let anyone make you feel inferior.
If you follow all what i told you above.. your teenage will pass really smoothly.
All the best young friend❤️
One Amongst You