I’m a freshman in high school interest in becoming an aerospace engineer. What classes should I take in high school that will help me?

Concentrate on a college prep course of study. Talk to your college counselor about your desire to attend college & study engineering. All you need now is a your basics, English, Math, Science. Aim for an honors program if your high school has that track. Take all 4 years of math & science so you will have a solid foundation before college. Good Luck.