“I want to go to Harvard because it offers better CS”
I do not believe that this is true. Michigan is very strong for CS. The strongest software engineer that I have ever worked with (or at least one of the three strongest) is a Michigan graduate. He has been very successful. My girlfriend way, way back when I was a graduate student at Stanford was a Michigan graduate.
Michigan is a superb university for computer science. Being in-state, you are getting a great deal financially (and will not even need to purchase a warm coat).
You have an opportunity to get a great education at a great university. Do not blow it by focusing your effort in an attempt to go somewhere else. Expect Michigan to be academically very demanding. Plan to work very hard and try hard to stay ahead in your classes. You are lucky to have such a great university in-state.