my big question

my big question is if there is an afterlife? what happens when we die? some believe that we are born again but not as a human but as something else, like a cat. how will we ever find out? yes I believe in god but will I go to heaven? or will I live again into a plant. there are so many questions that I want to be answered. it really gets me thinking. guess I just wont find out till I die.