Such great advice given to you here!
One thing that I would suggest is to get an honest assessment regarding your talent level from someone who is objective and really knowledgeable regarding college MT auditioning. I think that both Mary Anna Dennard and Ellen Lettrich (@MTTwinsinCA mentioned above) have assessment sessions available.
I’m not suggesting this to deter you, but it would be helpful for you to know how competitive you would be and how much of an uphill battle you’d have. The competition is fierce . . . but if you had a positive assessment (via Skype) then that would be helpful in trying to convince your parents to support you.