Hmmmm Well everyone is going to do Youth Culture and by far it will be your easy option but everybody is going to do it.
Right I'll sum all three up i think this will be easyer:
The Natural World:
Aim for the impressive, everybody sees photos of wildlifes day in day out, so go for something local like the wild fox. Go out towards the evening or at nigh and capture them for instance. But make them stand out. The key to wildlife photography is to keep those photos clean and sharp. I mean you need to big up the world here.
The Camera never lies:
Well with this you have two options, good and bad.
You can either go down the good route show you and your friends on a day out for instance but make them as candid as possible. But show the happyness and the great feeling with being otu with freinds and how good life can be.
Or the bad:
Now you can do a few things.
Tell a story, now i don't know if you are 18 but if you are and my advice is don't go too far with this, is the story of going out. obveously you won't be drinking.
But show the start when getting ready, the way there say in the taxi a black one i would suggest, then show the progression of being drunk, your friends namely, then move on to home with your friends drunk feeling ill and just showing what a night out does to your body in the end. Obveously stay sobar for this.
Don't take candid shots of tramps, it's the oldest thing in the book and won't impress anyone. What you can do is, show the daily life of one. Now if your going to do this bring a few friends mainly big males. and stay with him in the day and let him show you where he goes and show the looks on peoples faces. Offer him something at the end of course.
Youth Culture:
Obveously you are young so you knwo what it's like to be young the freedom, for instance most teenagers and younger people feel as their never die. So try and get an irony shot in there, maybe find an nhs advert and your friend smoking or chuging a a vodka bottle, a empty one with water of course, you don't want him to end up in hospital.
You can also show the public view on you aka chavs but becarefull you don't get your camera done in. But get some irony in there.
Hope i have helped
Best wishes with the project.
James H.L