Dear Inginer,
As an international student, you might try to the Colorado School of Mines or well I am not in my office, so I cannot remember the name exactly. Also if I were in Bulgaria, I would visit American University in Bulgaria. They are fully accreditated and were started as part of a USAID program. Have you been to your educational advising center in Bulgaria to ask them for help? You can find a center near you by visiting www.educationusa.state.gov. Then just click on the map. Generally these centers have many free services and good research libraries to help you find a school that offers scholarships to international undergrads that have strong math and science skills. You might also consider taking subject tests in Math and Physics just to showcase your talent.
International students sometimes get a pass on the reading and writing sections if they apply to a school that has strong math and science programs. Admission committees often realize that your langauge skills will improve quickly once you are in the USA. I have several students who performed poorly on the verbal compared to their math, and now they are carrying about 18 hours per semester with very high GPAs.
I think that the educational advising center in Bulgaria could help you with this.
Good Luck,
Elz