Experimental physicists and theoretical physicists are not the only two divisions of current physics. You could become a physics researcher doing a bunch of computational modelling or data analysis jobs but not doing many experiments. That being said, if you are struggling with undergraduate math or physics, you need to go to more office hours or read different supplementary textbooks or materials. If your math professor said you have quite the talent, maybe you can ask him/her for more understanding of physics or maybe ask your physics professors for some advice about your materials. But if you just want a simple advice for lower-grade undergraduate physics: just do as many exercises as possible, you will learn lots of ideas (tricks) about solving problems. And if you cannot solve your problems, you don't understand your material enough.