In your situation, in my opinion... You have a desire, goal which is good, but you have from what you are saying financial woes which may restrict you.
If that was me, the first step for me would be to go out of my way to find any work that will pay off that loan, so that the choices that I have are varied as apposed to restricted.
To be successful at something you do never stop learning.
But, to become successful in a field, you have to sometimes take steps back to go forward..
At this point money, income, clearing debts is your priority.
From there you will obviously then have more choices...
I studied for a Diploma in Business at 40, passed.. That opened the door to my own business instead of working for someone... That was my goal.
Follow your dreams, but be realistic in how you are going to get there.