What career should I choose?

Hello, I'm a high schooler, and I was wonder what should I choose to be a Physicist or a Aerospace Engineer or a Civil Engineer. All three are intresting, college money isn't an issue either. I'm am a math and science buff. I'm very intregued by Physics and Chemstry. I love to build things. I also want to change peoples lives for the better. I'm very creative (I once came up with a more cost efficent way to get into space I also modeled an entire city of the future out of popcicle sticks). I like to design new systems to make things more efficent such as a super-high-speed highway with zero accidents. Space exploration is very intersting to me and something i want to be a part of.