Those reincarnation really happens?? and if there's really is--how can i know who is really the one for me??

im just kinda curious whats really the point of life--- why we have to live just to die afterwards-- to be brought out to the world and afterwards die--- and why do we have a religion and believing that theres still life after death--- if theres is really--- why do we need to suffer and be reincarnated again--- to be born as another person in a different time and dimension?? well im just wondering---