Well, at least you're in the right direction.  I would recommend to start off by working at a diverse interior design company that will pay you well, provide the most free on-the-job training, and that also has a plethora experienced designers so that you can find a mentor.  Then when the time is right, you can decide on the specific niche and also decide if you want to go out on your own or not.  Plenty of time.  No rush.  Do it right, not fast.  That's what I'm doing right now.  I'm just further along the path than you and in a different industry.  I'm 5 years out of college.