I can sympathise with your frustration at being locked into a training programme that is not exactly floating your boat, but agree with what's been said already. Better to stick with it, complete your training, then reevaluate your options towards the end of the term. If nothing else, it will show prospective employers or colleges that you can commit and apply yourself to something and see it through and recognise it's value in the longer term, as opposed to just flitting about when the going gets tough. That counts for quite a lot and all the while you are gaining valuable work experience which will be transferable in other ways. You are very young so you have time on your side. 
That is f**king terrible advice.
Sticking at something you hate and know you aren't going to use does not show commitment and application. It shows you lack the ambition and spine to take control of your life.
This not a 6 week summer job, it's a commitment to about 10% of his working life. That just happens to have a nice neat breaking point coming up.
Lets say he finishes after 5 years. Does he then waste half a decade and start again. No, he gets a job. Then he has a house, a wife and a baby. So he cant very well start again, so he'd better go for that promotion. 40 years later he realises he hates his job, has always hated his job and although he's been well compensated for his time he's been unhappy and his life has been a grind.
Just go back and read the original post. OP has already made his mind up and is looking for validation.
OP decide what you want to do, then go and do it. I had the same thing after my first year of university. I am a person who has always taken the safe option as I am apprehensive of change. But taking the step to change to engineering was the best decision I ever made.
Life is far too short to be doing a job you don't like. It consumes most of your waking hours.