First off gain some self control and simply DON'T BUY the things you don't need. It's called common sense. Next, go to a local credit union or bank and open up a savings account. You can even open up a checking account and have you money direct deposited in. You can also have multiple savings under the same account so you can save for different things. Next, put all your expenses and your budget down in writing so you can clearly see what is important. Then write down exactly what you are going to set aside out of your money for things like a car and put the money in a savings account. Viola! You have saved money!
If you want that car bad enough you'll figure out a way to stop squandering your money on other things. Taking a moment to ask yourself "do I really need this" before every purchase might be a good place to start.
So, stop wasting money like an idiot, whatever that is. Then you'll same more.
sorry, but you are 19 and shouldn't be their priority anymore.