Is my dream of owning a lambo unrealistic ?

No doubt you can own one man. However there's no reason you should have to spend all of you money on a car that's so expensive like a Lambo. Try looking at Corvette's or Ford GT's, their probably as fast as anybody would want a sports car to be unless your a professional racer, they still look really good, and their not 300-500 grand!!! I'm just saying that your young and you've still got options. However, if it's your dream to own a Lambo, then I'd say it's not unrealistic at all.