Don't say that!
Keep trying, my helicopter was bad too! try something simple, like a skate board
sorry, don't try the skate board.
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creating a vehicle is hard, yes. But, I can help. If you take what ever you want to make and draw a net form, you have a structure for a base.
Like a cube, for example
there are 6 sides, or 6 faces to a cube. A net for the cube has four squares in a row, and one square on the left, and one square on the right. if you lightly sketch this onto a square, or rectange, you can see a cube. But the rest (between the corners) needs to be tucked in. This can be done with diagonal folds. then you have a cube. This has the same prinipal for a vehicle. My Vintage beetle, and the locamotive uses this very principle. I would use graph paper when you design your vehicle, it helps create a net.