Which Major Should I Choose: Physics or Mechanical Engineering?

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Im not sure. I wanted to get a Ph.D in physics so I can do my own research but I’m wondering if that's the path I should take if its alignment with my goals. Like I said I am stuck between Physics, mechanical engineering or engineering physics.

Again, the most basic goal is Physics, first for undergraduate degree. You will need to decide yourself how to specify and choose courses (Physics, Engineering, others) as you go. If you cannot make more specific choices along the way, you will remain lost.