I was feeling the similar way. I volunteered in different labs using different methodologies/studying different topics. I also believe having this experience in different schools is important since the schools may have different cultures, and that may also help you to judge better when you need to choose between schools when you get your acceptences.
If you are in your 2nd year or so, and if it is hard to comprehend the research papers, you can first read textbooks or take some courses from coursera.
Another thing I did was to attend some conferences. Those may be very basic undergrad conferences, or a national congress. I think it's worth it even it is expensive, because you can compare different topics and also have the chance to go talk to professors/researchers and get a summer internship.