Transition from Electrical Engineering to Physics My name is Luka and I am currently third year of electrical engineering, specifically Power and Control Systems. I have very high GPA, and I am certain I will be applying for MSc in two years (I have to finish this year, and specialize next year in order to get Bachelor). I am 100% sure that I will pursue PhD after MSc and hope to continue working in academia. But there is one problem in this. During these years I have confirmed that my passion for physics(especially high energy physics)is much greater than one for engineering. In fact, I do not think I would be able to do any research in engineering. Because of this, I want to switch fields and to get into MSc program for High Energy Physics. My question is: Is there anyone with similar experience that has made a successful transition? And if it is possible, is it possible to follow the material? Any advice or information would be very helpful. Thank you
I have seen some people do this and I myself am have done something similar; it is certainly possible. 

My university didn't have much flexibility for taking electives or minors either. Your best bet would be to convince your current university (or any local university) to take you on maybe as a non-degree seeking student after graduation (maybe even audit) to fill in the gaps in your general physics knowledge, with a view to eventually transition into the MS program. Doing so would help convince the professors at the institution to admit you into the program by subduing their doubts regarding your background in addition to forming some connections (I volunteered as an RA at a lab in the physics dept. in an area overlapping with my previous engineering background, which helped my get into the physics program at my current institution). Depending on the university, they may even let you into the MS program directly, with the caveat that you have to take some remedial undergraduate courses. 

While you probably won't be doing high energy physics right off the bat, you will probably have the opportunity to do graduate level coursework in physics and that will set you up well for a future PhD in HEP or further graduate research in your field of interest.

You might find this link interesting 
https://physicsafterengineering.blogspot.com/2018/06/my-journey-into-physics-after.html