i kno this isnt the exact place for things of this sort, but ive been feeling really down these days, and my grades are dropping, and nothings fun anymore, and i dunno, does anyone kno how to make me better. i need help, cause nothings happy anymore.
I don't really have any advice on how to get out of this one, except to say often a series of problems have one common denominator. Falling grades, for example, can be the result of you having a tough time because you no longer feel able to concentrate on your studies. A knock on effect of falling grades then means you perhaps feel bad about them, which extenuates your whole "feeling down". In the end, as things become worse, you feel as though you are in a spiral.
What you really need to do is try to sit and down and think what could be at the root of all of your recent problems. It could be anything; family issues, school, relationship problems, boredom etc. If you can isolate the main issue, however, and then solve it, you should find the other problems will seem so much lighter.
I'm not sure of your age, but if you are in your mid teens, you will find you are not alone in how you feel. The majority of people go through similar problems at that age, and generally these problems miraculously improve (generally with the leaving of school) towards the end of your teens. It is a natural transition time in one's life, when your world is changing from being a child to an adult.
Often the symptoms you describe are caused by the frustration of being caught in a rut. You may feel as though your life is going nowhere, and you are bored with everything. If this is the case, try to break your rut. Do something dramatically different. Do something you have never done before. Go to places you don't normally visit. Try to meet some different people. Try a new hobby. It's like giving your life a spring clean.