I don't really think that anyone has a purpose for being here. It's just a circular cyles, like every living thing/being is going thru. Having a ability to think and choose what you do and grow a conscience will just make the journey thru life a more entertaining in a way even if you had to do it all over again knowing what u did before. but then no one said that you are not living a life the same way that you have done it before.... and the the deja vu u get...are some things u happen to remember from that cycle:-) farfetched?