Now that I know what I want to do, how can I do it?

I want to go back to school for graphic design. All my life, art was my “thing” – my awards, my trophies, my spare time, private lessons. When I applied for college, I didn’t get into the program I wanted, and was devastated. And embarrassed. I went in the opposite direction and into the arms of science. I finally (and ecstatically) admitted to myself that this is what I really want to do, and I know I would be really good at it – but how can I go back to school? I can’t get a loan, because I have a bit of money in a trust, which I shouldn’t touch and don’t have access to until I’m 30 anyway (I’m 28).

Any advice??