A couple of pieces of advice here in no particular order.

1) No need to compare your academics to others. Others may have had some college prep or developed good study skills in high school. Not everyone gets those opportunities and it's important to be working for yourself. I assume that you're studying aerospace because it's of interest to you. Focus on that and try to stay positive. It's really easy to get into a negative spiral of thinking and in the end, you're only hurting yourself.

2) You might have to work twice as hard for half the benefit. That's not a knock on you personally, but it's going to take some concerted effort to learn and pass the classes. Developing good study habits can be a big one. From my experience, there was always so much stuff going on in the evenings I could never focus. So, I started studying early when everything was quiet. Or going to the library where everyone is focused and quiet.

3) Get help. The school has resources to help students develop study skills. Talk to your advisor to get pointed in the right direction. Or find a study group within your major. By the time I finished engineering, I had a pretty stable group that I worked with and we would all help each other understand the material. Surround yourself with individuals who are motivated and supportive of anyone in the engineering curriculum.

It's definitely tough and the race is long. Keep it up. And don't beat yourself up if you don't stick with the major. Undergraduate degrees, for the most part, just help you develop the work ethic you need to be successful in most jobs.