@sadgirlygirl: I don’t think you are depressed, perhaps you are just a teenager. Although a lot of people have their “teen moods” till 18, I know plenty or people who get them till their early 20’s I also know of people who finished them at 16/17 while got them as young as 10.
Some of the things I do when I’m in a rut is I will do the things I love. What is something you love to do? A sport? Dancing? Art? Make it a priority to take classes, make time for it, etc.
It also helps to find out what your way of expression is. Some people express themselves through writing, art, talking, dancing. I personally express myself best when singing. Once you find that one thing that just makes you feel like you are expressing your truest self, you will feel better too.
Another thing is to give yourself time to calm down, wind down, and internalize things going on in your life. During the day, and before bed make time to just be alone, breathe, think with yourself, get a coffee. Let life slow down a bit.
Good Luck!