If you are not interested in something ... It will be the most difficult thing in the world!
It is the simplest answer which can be given to that kind of question.
When I was following my first degree in the University of Moratuwa I had many friends in many engineering fields. My roommates were from very diversified engineering fields. As I felt those days I think learning any engineering fields requires great scarifications and you must interested what you are following. Follow a field which you can dream .... Follow a field which you can make future happens ....
Selection of the engineering streams is a decision you must take very carefully ... because you are going to live in that field most probably for the lifetime