Having poor grades will limit your choices for college regardless of your chosen major. However, it certainly is not impossible, and there are often options to study at a community college for a few years to improve your academic standing if you are not able to get into a chosen college with your high school record. The question should be, is aerospace engineering what you really want to do? If so you can speak with a guidance counselor about your options and chart a path that will work for you. Good luck!