Join the Army for a few years. Get your HGV licences.

Even when you are 21 and do your test you will struggle like hell to get a job as companies wont pay the insurance for some one under 25 as its beyond a joke. Then there is the problem of experience. No one will take you on with out any (but then how do you get it?). Only way then is agency work which is shite most of the time.