Mira hombre...you just graduated from Le Cordon Bleu cooking school. You really, in my opinion, don't need to go to the Culinary Institute of America at this point. If you can swing it, you should try to come to America, and find a job. Establish a credit history. That's how it works in America. You start working, once you have a job for awhile, then you can take out a loan or apply for a credit card. Once you have the loan or the credit card, you use it wisely. Don't go "hog wild" and charge up the entire credit limit. Because once you show that you have a stable work and credit history, then you can qualify for more credit. Loan people rely a lot on what's called your "credit score". This credit score depends on many different inputs, and Fair Isaac doesn't tell you or me what all goes into the mathematical formula that is used to calculate the "credit score". But mainly, work and wise use of credit are essential. Making payments on time is essential.
Anyway, if I were you, that is what I'd do. It would be pretty much impossible to find an "American" who doesn't know you to be a co-signer. Because being a "co-signer" means that they are guaranteeing that if Gustavo doesn't pay back the loan, they will. Frankly, that's asking a lot from a complete stranger.
Your situation is tough, but you do have your degree from LCB, so I would try to use that to find a job situation. You may have to take the risk of moving to America first in order to be here to apply for work. Life is full of risks, so you have to determine how much risk you are willing to take.
That's the best advice I can give you.