Different high schools in the US compute weighted GPA very differently. I have heard of schools where a 90 is a 4.0, and one daughter went to a school where a 97 was an A+ but counted as a 3.7. Universities know that high school GPA does not compare well between high schools.
Universities will look at your actual grades, and might also compare your GPA with other students from your high school whose GPA is computed the same way as yours.
Take the classes that make sense for you. Try to keep ahead in all of your class work. Pay attention in class. Do not worry about how your GPA is computed.