Possible major change?

Long story short I was admitted to Michigan State University and I have committed. I put Mechanical Engineering as my major preference but lately I have really been questioning my decision with that.

I think that I only decided to put that as my major because my dad has been really trying to push me into it. I’m not complaining, I’m glad that he is pushing me to be successful, but lately I have become more conscious of the fact that perhaps it is more what he wants me to do rather than what I want to do.

With that said, I’ve been doing research on majors and, while i thought I had all of my decisions figured out, now I don’t know what to do. I also feel like going with no preference would be a waste of my time.
Some things that have started to interest me are Research and Development, some physics-related things, and possibly some medical things (not sure exactly what). I don’t think that I would enjoy doing all of the physical dirty work with all of the doctor/dermatologist/etc. I do like to learn about neurology and such but I could not imagine myself going through 8+ years of school for it. I think that it would be interesting to do brain research to come up with a cure for alzheimers and things like that, though.
With research and development, I have always imagined myself enjoying developing products and prototypes for consumers. I think that it would be cool to put things into everyday life that people could use.
Basically, I’m all over the board. If anyone has any recommendations, that would be wonderful. I just know that I really don’t think that engineering is right for me and I think that it would be in my best interest to change.