Go with your heart is what I would say
I left school and went to college to do a secretarial course and improve my gcse's. Many years later whilst working I started a HNC in construction. I had a change in industry at that point and now work in construction whilst doing a part time degree. Its hard work but has been worth it so far (suga: message to self remember you love what you do, when the days are difficult!).
The course sounds like a good place to start. It will give you the opportunity to learn whilst not throwing you into a new completely new environment... hope you can follow your dreams... sugax