How did you decide your specialty?

As a student, you get many different clinical experiences but I was wondering how you decided what was right/wrong for you? I hope it isn't (but highly suspect it might be by trial)...

My problem now is not enough (extended) exposure and finding interests in too many things! Would anyone suggest volunteering in another capacity (not as a student) as a good idea?

I am asking because my college only allows consolidation in the following areas: long term care facilities, rehabilitation, palliative, medicine, surgery, maternal-child, mental health, community and/or complex continuing care. and I want to pick a worthwhile choice. Any suggestions?

Thanks for your help