Before thinking of taking a course I would ask you.
Do you feel qualified now to be a interior designer? mabye some technical stuff you might need help on but that will be done with a mentor.
Do you think you have a great eye for design right now?
Basically what I am saying is college or degree can’t make you a good interior designer you have to have it in you right now. All college does will give you a paper and you Might even make some great stuff in college or see other people college work and say I can do this, but truth is this is done after having the professor critique your work till it’s good, in the real world this won’t happen you need to be born with the talent.
And if this is the case why go to college at all, get a job someone will hire you if you have talent and learn from real life.
My .0002 cents