hi Hannah
I know how you feel. At 14 i was hit with depression. Took til my mid-30's before i really got any serious improvements. You sound a lot like i did. That i couldn't go to anyone for help. I did manage to keep some friends, but even then sometimes i would feel lonely and friendless. I know the sense of fatigue, restlessness, frustration, anxiety, and everything that goes along with it. I also know you need to make friends. You need to tell people. The more you isolate yourself the worse you make it for yourself, and the more you need to seek the right help.
Let me give you a few tips. They may sound like they wouldn't help, but these are the first steps you need to take. If you do seek professional help, a GOOD doctor will actually have you do this before trying to push meds on you. Meds should only be a last resort when you've tried everything else.
OK, 1st, make sure you're eating healthy. Fruits and veggies, cutting out caffeine and sugars. 2nd, exercise. Spend at least 20-30 mins a day 3 days a week doing a good physical workout of some kind. Jogging or walking, swimming, anything that gets the blood pumping and keeps it pumping.3rd, Sleep. Keep on a regular sleeping pattern. Try to get up and go to bed the same time as much as possible. If you need extra sleep, go to bed early, don't sleep in.
I know these may sound like cheesy cliche answers, but they're not. These are proven methods that can directly effect and help depression. How much they help may vary by person, as people get depressed for different reasons and to different degrees, but most people should get some kind of positive effect from them still.
Seek out professional help. But let them know, firmly, from the very start, that you want to try everything else before medicating. Research holistic meds if the doctor doesn't know them himself.
Hope this helped. Don't give up, you can beat this, even though it seems ominous.