Should I major in Mechanical Engineering or Electrical Engineering because I have many interest?

Well, I am a senior in high school. I will attending LSU starting this summer. The start of my senior year, I thought I wanted to go into EE because I love electronics and have always thought hey maybe I can create electronics. I was going to double major with Computer engineering since its like the same thing. and I would be able to get a two for oner. I have never considered any other engineering until the other day. Even though I love computers alot, I also have a pion for designing things. I really loves cars, the way they move interest a whole lot. I have been dreaming lately about designing a whole(the new way how the body of the car can look and how can a motor run better). I downloaded a program all sketchup since i cant get my hands on autocad. I have been loving designing houses on sketchup, and I just want to design a car on there. I have always been one of those kids who wanted to know how things work, and i am a great problem solver. But I can't help this problem, I need help. Also, I know i want to own my own business one day, hopefully become partner of an engineering firm. So help with the best of your abilities. Thanks in advance!