Yeah Peaceangel, exactly as tim said you have to know yourself that you can do it, and try not to take notice of people around you that are getting you down....and don't ever let anyone tell you you cant do something, as long as you believe in it, you can do anything you want to.
I don't know if this helps you, but when i'm doing a lot of projects and essays, just try not to panic, thats the worst thing that you can do, and just take a breather, i have to remind myself of this as i have my business studies exams coming up!
peaceout!