First of all, if you're working construction then maybe a Raptor isn't the truck for you... depends though, are you a government employee using their equipment and just using the Raptor to commute/fun, or are you planning on using the truck to haul, tow, etc? It can be done with a Raptor, but its not the most comfortable/ideal situation.
Second, you have no credit and just got a decent job... maybe instead of spending every cent of your hard earned money for the next 3 years, you start work and see how things shake out. Again, what kind of job, guaranteed hours, or if things slow down they cut you? Can you handle a $900 a month payment, not including gas, insurance, and maintenance? (probably a low guess at loan amount with no money down extended years, etc... we pay $750 for 5 years with 10k down, stellar credit and a 2.75% interest rate)
Like others have said, save up, try and get a credit card to build some credit... DON'T USE THE CARD... just get approved for it.. If you're denied, wait a few months before trying again. There is no way you are getting a Raptor without a down payment at your age, and hell a couple years in and you might not even want one anymore. Dreams are awesome kiddo, but I can guarantee that 10 years down the road you'll get a chuckle out of the 19 yr old you and your dreams. Life isn't always fair and it tends to hand you shit on its own schedule not yours. Work hard and you'll get what you want/deserve.