You don't mention if your interest is about working in the aerospace industry which would imply getting a degree in mechanical, electrical or aerospace engineering or if you would like to work in some other areas such as research in astrophysics. I'm going to assume the former since that is where I can give you some hints ;-)
You can pretty much work through the first two years of any technical degree by yourself by using online learning materials. Math is essential, so calculus, differential equations and linear algebra need to become something natural for you. You don't need to get fancy, standard undergraduate materials will get you through your bachelors, but if you are good at it keep on trying new things and learning as much math as you can, you won't regret it.
Physics is essential, and it can be harder to grok than math sometimes. You need to understand what the concepts and ideas mean, and be able to manipulate them with ease. Classical mechanics, besides being one of the most beautiful subjects in physics, is probably the most important one you will ever learn for your undergraduate degree. Also, physics requires math, lots of it, applied in creative ways. I learnt more math in a mechanics 1 class than in any other course I had ever taken. I recommend getting some minor or even better a dual degree in physics, but I realize this might be too much for some people.
You also need to know how to program, Matlab, LabVIEW and also C, C++ or Python are really popular, depending who you ask. knowing many languages well will put you a notch or two above everyone else when it comes to employment.
Finally, I would like to say that the space field is very very broad and there are multiple ways to make a career in it. Try to leverage your experience with computers, try moving towards the hardware side, learn about Arduino and embedded programming, complete a couple of fun projects and see if you like it. Maybe you will be better served by getting a degree in electrical than in mechanical engineering, there is no right answer. Try your best and if you decide to go through keep going at it no matter what, the payoff is definitely worth it. Good luck!
You can pretty much work through the first two years of any technical degree by yourself by using online learning materials. Math is essential, so calculus, differential equations and linear algebra need to become something natural for you. You don't need to get fancy, standard undergraduate materials will get you through your bachelors, but if you are good at it keep on trying new things and learning as much math as you can, you won't regret it.
Physics is essential, and it can be harder to grok than math sometimes. You need to understand what the concepts and ideas mean, and be able to manipulate them with ease. Classical mechanics, besides being one of the most beautiful subjects in physics, is probably the most important one you will ever learn for your undergraduate degree. Also, physics requires math, lots of it, applied in creative ways. I learnt more math in a mechanics 1 class than in any other course I had ever taken. I recommend getting some minor or even better a dual degree in physics, but I realize this might be too much for some people.
You also need to know how to program, Matlab, LabVIEW and also C, C++ or Python are really popular, depending who you ask. knowing many languages well will put you a notch or two above everyone else when it comes to employment.
Finally, I would like to say that the space field is very very broad and there are multiple ways to make a career in it. Try to leverage your experience with computers, try moving towards the hardware side, learn about Arduino and embedded programming, complete a couple of fun projects and see if you like it. Maybe you will be better served by getting a degree in electrical than in mechanical engineering, there is no right answer. Try your best and if you decide to go through keep going at it no matter what, the payoff is definitely worth it. Good luck!