I think someone have trouble with being realistic. You can't really say on one hand that you want to go to the best conservatories in the world, and on the other hand, not being able to afford them.
Which do you see as the best in the world?
If you say Jilliard, Curtis, and RCM, you are very wrong. Germany have many very fine ones, which are very much cheaper. You have to learn german, but that's it. The Netherlands as well.
Don't only look into the obvious ones.