Does anybody believe in another /previous birth ???

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Acoording to hindu religion practised in india , evry human being goes into another birth . and the sufferings he undergoes in this birth is cuz of the sins committed in previous birth . so if we want to have a good birth again in this earth we must be truthful and not do any sins. I think this must be true , cuz when i see different kinds of poeple....some who r very rich , some who have lots and lots of problems in life, some poepl who dont even have money to eat once in a day ....i feel this next birth concept must be true. cuz y should soem suffer more and many others on the earth ?? y will god give such differences??? wat is ur opinion??