I don't think that the fact that you don't like labs detair you from being theoretical/mathematical physicist.
Well I think you too much paying attention to the grades in those classes, I myself not that good at labs, mainly because I'm not the type of monkey who just do the task at hand (which is what the labs are really there for), I also want to understand why and when should the resolution of the machine be counted as a measure of the inaccuracy of the measurement, and when to use other options.
Don't pick a degree judged only by your grades, cause they usually determined not only from you curiosity alone.
For the labs for example, as you said you need a good partner, for example in my first semester I had a terrific partner and in the second semester a horrible one, ofcourse you can do the labs by your own but that would take too much time, so really it's about having a good partner with you that make the grade, at least in labs.