@skylight11 See the responses for the similar question raised recently.
http://talk.collegeconfidential.com/pre-med-topics/1925907-what-major-should-i-go-into-for-medical-school.html#latest
Since you are in high school, at this point, do the diligence related to identifying a good school (preferably which is good for pre-med and/or engineering in general). Once you are in UG, you will have opportunity to do variety of courses in freshman and then can decide major.
I understand some top schools may except you to declare major in your app now and you need to make a call on those few (for example UCB, getting hard for Electrical and Computer Science and you need to declare).