I want to come to America and go to school just for 11 and 12 grade after that I want to stay in America and do Architecting and Interior Designing at university. Is that possible and how?

Who will you live with and where? Do you have family in the United States? I need more information to help answer your question.

High school isn't the same situation as College would be as an adult.

Yes it is possible. In fact there are some groups, that do exchange programs for high schools. Several of our Chinese high schools send students to American high school and they live with "host" families. In other cases they go and live with family members in America.

The rules differ from where you live, for admissions. If you do not live in a English speaking country, you will have to take and pass a National English exam.

After you are accepted in a high school, and living arrangements are made, you have to apply to the US for a student visa.

You can look at some of the private and international schools that will accept F-1 students.